{"id":420467,"date":"2026-05-04T23:15:00","date_gmt":"2026-05-04T13:15:00","guid":{"rendered":"https:\/\/www.nasa.gov\/?p=991983"},"modified":"2026-05-04T23:15:00","modified_gmt":"2026-05-04T13:15:00","slug":"lageos-an-earth-science-mission-built-for-enduring-precision-2","status":"publish","type":"post","link":"https:\/\/www.vibewire.com.au\/?p=420467","title":{"rendered":"LAGEOS: An Earth Science Mission Built for Enduring Precision"},"content":{"rendered":"
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2 min read<\/p>\n

Preparations for Next Moonwalk Simulations Underway (and Underwater)<\/h1>\n<\/div>\n<\/div>\n<\/div>\n
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Technicians at NASA’s Goddard Space Flight Center helped complete prelaunch testing of the Laser Geodynamic Satellite (LAGEOS). LAGEOS was the first satellite devoted exclusively to laser ranging studies.<\/div>\n
NASA\/Goddard Space Flight Center<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

On May 4, 1976, a spacecraft resembling a disco ball entered orbit almost 3,700 miles (6,000 kilometers) above Earth. This shiny, two\u2011foot\u2011wide (60\u2011centimeter) sphere called the Laser Geodynamics Satellite, or LAGEOS, is covered with 426 retroreflectors\u2014small mirrored prisms designed to bounce laser light directly back to where it came from. Beneath its aluminum exterior sits a dense brass core that makes LAGEOS incredibly heavy (900 pounds or 400 kilograms) for its size.<\/p>\n

That weight was intentional. The satellite\u2019s high mass and compact, spherical design allow it to follow an exceptionally stable orbit, perfect for satellite laser ranging<\/a>. From stations around the world, scientists fire pulses of laser light at LAGEOS and measure how long the light takes to return. Because the speed of light is known so precisely, researchers can calculate the distance to the satellite within just a few millimeters.<\/p>\n

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Historic concept art illustrating how the LAGEOS satellite reflects laser light emitted from a ground station on Earth.<\/div>\n
NASA<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

Over these last 50 years, these ultra\u2011precise measurements have helped track the slow movements of Earth\u2019s tectonic plates, monitor tiny shifts in the planet\u2019s crust, and measure motion along major fault lines. LAGEOS’s data have sharpened our understanding of Earth\u2019s shape and refined models of the planet\u2019s gravity field. LAGEOS has even contributed to tests of Einstein\u2019s theory of general relativity<\/a> by helping confirm predicted effects on the orbits of massive bodies around Earth.<\/p>\n

In 1992, the Italian Space Agency\u2013built LAGEOS II, a near\u2011twin of the original LAGEOS satellite, was launched aboard space shuttle Columbia. With two satellites to compare, scientists could make even more accurate measurements. Together, they have become long-term benchmarks for Earth science.<\/p>\n

Despite being among the oldest scientific satellites still in service, LAGEOS is still going strong. Its simple, maintenance-free design, along with minimal drag in its high orbit, means that it will likely continue to circle the globe for millions of years.<\/p>\n

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6 min read<\/div>\n
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Now 40, NASA’s LAGEOS Set the Bar for Studies of Earth<\/h3>\n<\/div>\n
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19 min read<\/div>\n
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Every Flight is a Mission to Planet Earth<\/h3>\n<\/div>\n

Observing Earth from space is one of the NASA\u2019s longest-standing science experiments. This photo essay…<\/p>\n

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5 min read<\/div>\n
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The Legacy of NASA\u2019s Voyager Mission<\/h3>\n<\/div>\n
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On May 4, 1976, a spacecraft resembling a disco ball entered orbit almost 3,700 miles (6,000 kilometers) above Earth. This shiny, two\u2011foot\u2011wide (60\u2011centimeter) sphere called the Laser Geodynamics Satellite, or LAGEOS, is covered with 426 retroreflectors\u2014small mirrored prisms designed to bounce laser light directly back to where it came from. Beneath its aluminum exterior sits [\u2026]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[20204,15639],"tags":[],"class_list":["post-420467","post","type-post","status-publish","format-standard","hentry","category-lageos-laser-geodynamics-satellite","category-nasa-history"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/420467","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/users\/13"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=420467"}],"version-history":[{"count":3,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/420467\/revisions"}],"predecessor-version":[{"id":420582,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=\/wp\/v2\/posts\/420467\/revisions\/420582"}],"wp:attachment":[{"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=420467"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=420467"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vibewire.com.au\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=420467"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}