Lighthouse Desktop

· 0 checks — Desktop Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

Why this matters

Performance issues directly impact user engagement and conversion rates.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/s/opensans/v44/memvYaGs126MiZpBA-UvWbX2vVnXBbObj2OVTS-mu...	60 ms
fonts.gstatic.com/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9RM3p2MO32OA.woff2	55 ms
/s/opensans/v44/memtYaGs126MiZpBA-UFUIcVXSCEkx2cmqvXlWqWu...	45 ms
/s/notosanshk/v35/nKKQ-GM_FYFRJvXzVXaAPe9hMXBxEu-8JKJiwNd...	45 ms
fonts.gstatic.com/s/aldrich/v22/MCoTzAn-1s3IGyJMVacY37H6D_A.woff2	30 ms
/s/raleway/v37/1Ptxg8zYS_SKggPN4iEgvnHyvveLxVvaorCIPrEVIT...	30 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:45.469 source:map[column:29 line:15918 type:source-location url:https://earthsky.org/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b6-2/js/webflow.js?v=1620812547627 urlProvider:network]] map[reflowTime:0.696 source:map[type:text value:[unattributed]]] map[reflowTime:30.497 source:map[column:85575 line:1 type:source-location url:https://earthsky.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1 urlProvider:network]]]

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-0-DIV

nodeLabel: div.full-height > div.full-height > a.post-card-v2-max > div.thumbnail

path: 1,HTML,1,BODY,1,DIV,3,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,A,2,DIV

selector: div.full-height > div.full-height > a.post-card-v2-max > div.thumbnail

snippet: <div class="thumbnail" style="background-image: url("https://earthsky.org/upl/2025/10/Birdcast-spring-mig…");">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

Why this matters

Performance issues directly impact user engagement and conversion rates.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size	Duration
ajax.googleapis.com/ajax/libs/webfont/1.6.26/webfont.js	5.9 KiB	280 ms
/css?family=Aldrich%3Anormal%2C%7CRaleway%3ANormal%2CNorm...	1.1 KiB	289 ms
earthsky.org/wp-includes/js/jquery/jquery-migrate.min.js?ver=3.4.1	4.9 KiB	54 ms
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	520 B
earthsky.org/wp-includes/js/jquery/jquery.min.js?ver=3.7.1	29.5 KiB	54 ms
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	2.7 KiB
/wp-content/plugins/advanced-ads/public/assets/js/advance...	3.4 KiB
/wp-content/plugins/gravityview/templates/css/gv-default-...	2.0 KiB
/wp-content/plugins/udesly-adapter-plugin/assets/css/ajax...	748 B
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	12.0 KiB	54 ms
earthsky.org/wp-content/plugins/novashare/css/style.min.css?ver=1.6.4	2.0 KiB
/wp-content/plugins/gravityview-featured-entries/assets/c...	376 B
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	9.4 KiB

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
/builds/core/772eda3/es2018/js/adthrive.min.js?deployment...	3600.0 s	370.5 KiB
c.aps.amazon-adsystem.com/apstag.js	3600.0 s	89.5 KiB
ads.adthrive.com/builds/core/772eda3/gdpr/vendor/prebid/es2018/prebid.min.js	86400.0 s	172.8 KiB
cdn.consentmanager.net/delivery/js/cmp_final.min.js	86400.0 s	101.1 KiB
cdn.id5-sync.com/api/1.0/id5PrebidModule.js	3600.0 s	29.5 KiB
/avatar/a9a17be643e1e15e7bc0af536161904bf2511a4d1994bf6d4...	300.0 s	21.2 KiB
b-code.liadm.com/a-018f.min.js	86400.0 s	46.0 KiB
/delivery/customdata/bV8xLndfODY2ODUucl9HRFBSLmxfZW4uZF8z...	3600.0 s	21.9 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
earthsky.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?	14400.0 s	11.9 KiB
/avatar/03044b5e3b4f48fd8edde59e9c64eb0592eaa9370edb27bae...	300.0 s	5.0 KiB
iframely.net/embed.js	86400.0 s	8.3 KiB
/avatar/18babf9ec75012cc0aeaf0f9158e0cd6b6abf449415bb9481...	300.0 s	3.3 KiB
config.aps.amazon-adsystem.com/configs/4fbba76f-7987-4fa2-9733-c27eb3a2170b	3600.0 s	2.3 KiB
ads.adthrive.com/sites/5d668609cc7cae09064f6362/ads.min.css	3600.0 s	779 B
sli.earthsky.org/baker?dtstmp=1776896478127	0.0 ms	538 B
/pj?url=https%3A%2F%2Fweb-cdn.bsky.app%2Fstatic%2Ffavicon...	604800.0 s	2.5 KiB
iframely.net/ssaE7ZR/thumbnail?maxwidth=320	604800.0 s	1.3 KiB

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail`	earthsky.org/upl/2026/04/C3-partialhalo-4-21-21-2026-SOHO-LASCO.webp	974.3 KiB	869.6 KiB
div.w-dyn-item > div.post-card > a.thumbnail-small > div.thumbnail `div.w-dyn-item > div.post-card > a.thumbnail-small > div.thumbnail`	/upl/2026/04/Native-American-old-dice-Robert-Madden-Color...	649.2 KiB	562.1 KiB
div.w-dyn-item > div.post-card > a.thumbnail-small > div.thumbnail `div.w-dyn-item > div.post-card > a.thumbnail-small > div.thumbnail`	/upl/2026/04/lineup-of-similar-looking-planets-ChatGPT-e1...	582.4 KiB	513.0 KiB
div.post-info > div > a.post-info-author > div.post-card-avatar `div.post-info > div > a.post-info-author > div.post-card-avatar`	/avatar/a9a17be643e1e15e7bc0af536161904bf2511a4d1994bf6d4...	20.8 KiB	19.3 KiB
div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail`	/upl/2014/05/nasa_global_selfie_2014_small.jpg.CROP_.prom...	38.1 KiB	6.3 KiB
div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.thumbnail`	/upl/2024/12/Geminid-meteor-shower-Tameem-Altameemi-Unite...	92.8 KiB	6.0 KiB

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 50 ms 19.0 KiB

URL	Transfer Size	Est Savings
/css?family=Open+Sans:300,300italic,400,400italic,600,600...	119.8 KiB	12.6 KiB
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	12.0 KiB	2.3 KiB
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	9.4 KiB	2.1 KiB
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	2.7 KiB	2.0 KiB

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 50 ms 45.7 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	116.9 KiB	39.2 KiB
/wp-content/plugins/advanced-ads-pro/assets/js/postscribe...	12.5 KiB	6.5 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 160 ms 119.8 KiB

URL	Transfer Size	Est Savings
/css?family=Open+Sans:300,300italic,400,400italic,600,600...	119.8 KiB	119.8 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 50 ms 662.2 KiB

URL	Transfer Size	Est Savings
/builds/core/772eda3/es2018/js/adthrive.min.js?deployment...	370.2 KiB	162.7 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB	129.8 KiB
ads.adthrive.com/builds/core/772eda3/gdpr/vendor/prebid/es2018/prebid.min.js	172.3 KiB	124.1 KiB
www.googletagmanager.com/gtag/js?id=G-5TNL0C8RD8&cx=c&gtm=4e64k1h2	176.3 KiB	62.9 KiB
www.googletagmanager.com/gtag/js?id=UA-412478-1	124.9 KiB	61.5 KiB
c.aps.amazon-adsystem.com/apstag.js	88.9 KiB	57.3 KiB
cdn.consentmanager.net/delivery/js/cmp_final.min.js	100.7 KiB	36.5 KiB
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	116.9 KiB	27.4 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
earthsky.org/upl/2026/04/C3-partialhalo-4-21-21-2026-SOHO-LASCO.webp	975.7 KiB
/upl/2026/04/Native-American-old-dice-Robert-Madden-Color...	650.4 KiB
/upl/2026/04/lineup-of-similar-looking-planets-ChatGPT-e1...	583.4 KiB
/builds/core/772eda3/es2018/js/adthrive.min.js?deployment...	370.5 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB
www.googletagmanager.com/gtag/js?id=G-5TNL0C8RD8&cx=c&gtm=4e64k1h2	176.4 KiB
ads.adthrive.com/builds/core/772eda3/gdpr/vendor/prebid/es2018/prebid.min.js	172.8 KiB
www.googletagmanager.com/gtag/js?id=UA-412478-1	125.2 KiB
/css?family=Open+Sans:300,300italic,400,400italic,600,600...	119.8 KiB
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...	117.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
div.connect-2 > a.connect-link > div.connect-icon > img `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.sub-top-wrap > div.wrapper > a.nav-brand-v1 > img.nav-logo `div.sub-top-wrap > div.wrapper > a.nav-brand-v1 > img.nav-logo`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.wrapper > div.footer-bottom > div.footer-bottom-left > img.footer-mini-icon `div.wrapper > div.footer-bottom > div.footer-bottom-left > img.footer-mini-icon`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.wrapper > div.footer-bottom > div.footer-bottom-left > img.footer-mini-icon `div.wrapper > div.footer-bottom > div.footer-bottom-left > img.footer-mini-icon`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card-content > div.post-info > div.post-info-block > img.mini-icon `div.post-card-content > div.post-info > div.post-info-block > img.mini-icon`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-v3-content > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow `div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow `div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow `div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow `div.header-block > a.more-link > div.more-link-icon > img.more-link-arrow`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey `div.post-card > div.post-info > div.post-info-block > img.mini-icon-grey`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.connect-2 > a.connect-link > div.connect-icon > img `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.connect-2 > a.connect-link > div.connect-icon > img `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.connect-2 > a.connect-link > div.connect-icon > img `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
div.connect-2 > a.connect-link > div.connect-icon > img `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...
EarthSky YouTube Channel `div.connect-2 > a.connect-link > div.connect-icon > img`	/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Document request latency

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 70 ms

●User Timing marks and measures 13 user timings

●JavaScript execution time 0.7 s

●Minimizes main-thread work 1.5 s

●Avoid long main-thread tasks 3 long tasks found

●Avoid non-composited animations 1 animated element found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 1,070 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 30 ms

●Avoid large layout shifts 4 layout shifts found

○INP breakdown

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Manage Your Privacy `div#cmpboxcontent > div.cmpboxtxtdiv > h1#cmpboxheadline1 > span`
Accept All `div.cmpboxbtns > span#cmpwelcomebtnyes > a.cmpboxbtn > span#cmpbntyestxt`
Earth `div.full-height > a.post-card-v2-max > div.post-card-content > div.badge`
Space `div.w-dyn-item > div.post-card > a.thumbnail-small > div.badge`
Shireen Gonzaga `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Space `div.w-dyn-item > div.post-card > a.thumbnail-small > div.badge`
Deborah Byrd `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Earth `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Human World `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Deborah Byrd `div.post-info > div.co-author > a.post-info-author > div`
April 22, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Space `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Today's Image `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
EarthSky Voices `div.post-info > div.co-author > a.post-info-author > div`
April 22, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Sun `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
C. Alex Young `div.post-info > div.co-author > a.post-info-author > div`
Armando Caussade `div.post-info > div.co-author > a.post-info-author > div`
Raúl Cortés `div.post-info > div.co-author > a.post-info-author > div`
April 22, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Astronomy Essentials `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Tonight `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Marcy Curran `div.post-info > div.co-author > a.post-info-author > div`
John Jardine Goss `div.post-info > div.co-author > a.post-info-author > div`
Deborah Byrd `div.post-info > div.co-author > a.post-info-author > div`
Kelly Kizer Whitt `div.post-info > div.co-author > a.post-info-author > div`
April 22, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Earth `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Kelly Kizer Whitt `div.post-info > div.co-author > a.post-info-author > div`
April 22, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Astronomy Essentials `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Editors of EarthSky `div.post-info > div.co-author > a.post-info-author > div`
April 21, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Astronomy Essentials `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
EarthSky Voices `div.post-info > div.co-author > a.post-info-author > div`
April 21, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
Astronomy Essentials `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Clusters Nebulae Galaxies `div.w-dyn-item > div.post-v3-card > a.post-v3-thumbnail > div.badge`
Bruce McClure `div.post-info > div.co-author > a.post-info-author > div`
April 21, 2026 `div.post-v3-content > div.post-info > div.post-info-block > div`
div.subscribe-v2-form-block > form#email-form > div.w-layout-grid > input.button `div.subscribe-v2-form-block > form#email-form > div.w-layout-grid > input.button`
VIEW ALL `div.wrapper > div.header-block > a.more-link > div`
Shireen Gonzaga `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Deborah Byrd `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
EarthSky Voices `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Paul Scott Anderson `div.post-info > div > a.post-info-author > div`
April 19, 2026 `div.post-card > div.post-info > div.post-info-block > div`
VIEW ALL `div.wrapper > div.header-block > a.more-link > div`
Marcy Curran `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Editors of EarthSky `div.post-info > div > a.post-info-author > div`
April 21, 2026 `div.post-card > div.post-info > div.post-info-block > div`
EarthSky Voices `div.post-info > div > a.post-info-author > div`
April 21, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Bruce McClure `div.post-info > div > a.post-info-author > div`
April 21, 2026 `div.post-card > div.post-info > div.post-info-block > div`
VIEW ALL `div.wrapper > div.header-block > a.more-link > div`
Kelly Kizer Whitt `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Deborah Byrd `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Kelly Kizer Whitt `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Cristina Ortiz `div.post-info > div > a.post-info-author > div`
April 20, 2026 `div.post-card > div.post-info > div.post-info-block > div`
VIEW ALL `div.wrapper > div.header-block > a.more-link > div`
Deborah Byrd `div.post-info > div > a.post-info-author > div`
April 22, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Kelly Kizer Whitt `div.post-info > div > a.post-info-author > div`
April 12, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Shireen Gonzaga `div.post-info > div > a.post-info-author > div`
April 9, 2026 `div.post-card > div.post-info > div.post-info-block > div`
Editors of EarthSky `div.post-info > div > a.post-info-author > div`
April 9, 2026 `div.post-card > div.post-info > div.post-info-block > div`
© 2025-2029 EARTHSKY COMMUNICATIONS INC. `div.wrapper > div.footer-bottom > div.footer-bottom-left > div`
WEBSITE BY MILKYWAY.CO `div.wrapper > div.footer-bottom > div.footer-bottom-left > div`
Update Privacy Preferences `body.home > div.adthrive-comscore > div.adthrive-privacy-preferences > a`
Terms of Content Use `body.home > div.adthrive-comscore > div.raptive-content-terms-footer > a.raptive-content-terms-footer-link`

These are opportunities to improve the legibility of your content.

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.cp-popup-wrapper > div.cp-popup > div.cp-popup-content > input.cpro-hp-field `div.cp-popup-wrapper > div.cp-popup > div.cp-popup-content > input.cpro-hp-field`

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.sidebar-block > div.iframely-embed > div.iframely-responsive > iframe `div.sidebar-block > div.iframely-embed > div.iframely-responsive > iframe`

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`
div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small `div.grid-small > div.w-dyn-item > div.post-card > a.thumbnail-small`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Black hole Cygnus X-1 has fast, powerful dancing jets `div.w-dyn-item > div.post-card > a.post-heading-link > h5.post-heading-small`
Black hole Cygnus X-1 has fast, powerful dancing jets `div.w-dyn-item > div.post-card > a.post-heading-link > h5.post-heading-small`
Visible planets and night sky guide for April and May `div.w-dyn-item > div.post-card > a.post-heading-link > h5.post-heading-small`
Lights out for birds during spring migration! `div.w-dyn-item > div.post-card > a.post-heading-link > h5.post-heading-small`
Happy Earth Day! Why do we celebrate it on April 22? `div.w-dyn-item > div.post-card > a.post-heading-link > h5.post-heading-small`

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

●`[role]`s are contained by their required parent element

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Input buttons have discernible text.

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●`button`, `link`, and `menuitem` elements have accessible names

●ARIA attributes are used as specified for the element's role

●Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●`[lang]` attributes have a valid value

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○`<input type="image">` elements have `[alt]` text

○Links are distinguishable without relying on color.

○Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

○List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
SharedStorage	earthsky.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.	earthsky.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge	earthsky.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Topics	ads.adthrive.com/builds/core/772eda3/gdpr/vendor/prebid/es2018/prebid.min.js line 62, col 181510

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL
/wp-content/themes/earthsky-testing-6c8e0a978c578089f4b8b...

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`