{"id":41086,"date":"2015-03-18T15:22:18","date_gmt":"2015-03-18T19:22:18","guid":{"rendered":"https:\/\/www.nasa.gov\/?migration=converted-node-345224"},"modified":"2023-08-21T12:20:12","modified_gmt":"2023-08-21T16:20:12","slug":"explorer-1-overview","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/history\/explorer-1-overview\/","title":{"rendered":"Explorer 1 Overview"},"content":{"rendered":"<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1615\" height=\"2048\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?w=1615\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg 2231w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=237,300 237w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=768,974 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=807,1024 807w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=1211,1536 1211w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=1615,2048 1615w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=315,400 315w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=473,600 473w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=710,900 710w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=946,1200 946w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?resize=1577,2000 1577w\" sizes=\"(max-width: 1615px) 100vw, 1615px\" loading=\"eager\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">The three men responsible for the success of Explorer 1, America’s first Earth satellite which was launched January 31, 1958. At left is Dr. William H. Pickering, former director of JPL, which built and operated the satellite. Dr. James A. van Allen, center, of the State University of Iowa, designed and built the instrument on Explorer that discovered the radiation belts which circle the Earth. At right is Dr. Wernher von Braun, leader of the Army’s Redstone Arsenal team which built the first stage Redstone rocket that launched Explorer 1.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>Explorer 1 was the first satellite launched by the United States when it was sent into space on January 31, 1958. Following the launch of the Soviet Union\u2019s Sputnik 1 on October 4, 1957, the U.S. Army Ballistic Missile Agency was directed to launch a satellite using its Jupiter C rocket developed under the direction of Dr. Wernher von Braun. The Jet Propulsion Laboratory received the assignment to design, build and operate the artificial satellite that would serve as the rocket\u2019s payload. JPL completed this job in less than three months.<\/p>\n\n\n\n<p>The primary science instrument on Explorer 1 was a cosmic ray detector designed to measure the radiation environment in Earth orbit. Once in space this experiment, provided by Dr. James Van Allen of the University of Iowa, revealed a much lower cosmic ray count than expected. Van Allen theorized that the instrument may have been saturated by very strong radiation from a belt of charged particles trapped in space by Earth\u2019s magnetic field. The existence of these radiation belts was confirmed by another U.S. satellite launched two months later, and they became known as the Van Allen Belts in honor of their discoverer.<\/p>\n\n\n<div id=\"\" class=\"hds-media hds-module wp-block-image\"><div class=\"margin-left-auto margin-right-auto nasa-block-align-inline\"><div class=\"hds-media-wrapper margin-left-auto margin-right-auto\"><figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-none \"><a href=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1060\" height=\"817\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?w=1060\" class=\"attachment-2048x2048 size-2048x2048\" alt=\"Explorer 1 satellite against black background\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg 1060w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=300,231 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=768,592 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=1024,789 1024w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=400,308 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=600,462 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/206621main_pic.jpg?resize=900,694 900w\" sizes=\"(max-width: 1060px) 100vw, 1060px\" \/><\/a><\/figure><figcaption class=\"hds-caption padding-y-2\"><div class=\"hds-caption-text p-sm margin-0\">Explorer 1 was the first U.S. satellite and the first satellite to carry science instruments. The satellite was launched on Jan. 31, 1958, from Cape Canaveral, Fla.. Explorer 1 followed a looping flight path that orbited Earth once every 114 minutes. The satellite went as high as 2,565 kilometers (1,594 miles) and as low as 362 kilometers (225 miles) above Earth.<\/div><div class=\"hds-credits\">NASA<\/div><\/figcaption><\/div><\/div><\/div>\n\n\n<p>Explorer 1 revolved around Earth in a looping orbit that took it as close as 354 kilometers (220 miles) to Earth and as far as 2,515 kilometers (1,563 miles). It made one orbit every 114.8 minutes, or a total of 12.54 orbits per day. The satellite itself was 203 centimeters (80 inches) long and 15.9 centimeters (6.25 inches) in diameter. Explorer 1 made its final transmission on May 23, 1958. It entered Earth\u2019s atmosphere and burned up on March 31, 1970, after more than 58,000 orbits. The satellite weighed 14 kilograms (30.66 pounds).<\/p>\n\n\n\n<p>A launch attempt of a similar satellite, Explorer 2, was made on March 5, 1958, but the fourth stage of the Jupiter-C rocket failed to ignite. Explorer 3 was successfully launched on March 26, 1958, and operated until June 16 of that year. Explorer 4 was launched July 26, 1958, and operated until October 6 of that year. Launch of Explorer 5 on August 24, 1958, failed when the rocket\u2019s booster collided with its second stage after separation, causing the firing angle of the upper stage to be incorrect.<\/p>\n\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 article_a hds-module hds-module-full wp-block-nasa-blocks-credits-and-details\">\n<section class=\"padding-x-0 padding-top-5 padding-bottom-2 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t<div class=\"grid-col-12 desktop:grid-col-2 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Share<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"padding-bottom-2\">\n\t\t\t\t\t<ul class=\"social-icons social-icons-round\">\n\t\t\t\t\t\t<li class=\"social-icon social-icon-x\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/x.com\/intent\/tweet?via=NASA&text=Explorer%201%20Overview&url=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2Fexplorer-1-overview%2F\" aria-label=\"Share on X.\">\n\t\t\t\t\t\t\t\t<svg width=\"1200\" height=\"1227\" viewBox=\"0 0 1200 1227\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M714.163 519.284L1160.89 0H1055.03L667.137 450.887L357.328 0H0L468.492 681.821L0 1226.37H105.866L515.491 750.218L842.672 1226.37H1200L714.137 519.284H714.163ZM569.165 687.828L521.697 619.934L144.011 79.6944H306.615L611.412 515.685L658.88 583.579L1055.08 1150.3H892.476L569.165 687.854V687.828Z\" fill=\"white\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<li class=\"social-icon social-icon-facebook\">\n\t\t\t\t\t\t\t<a href=\"https:\/\/www.facebook.com\/sharer.php?u=https%3A%2F%2Fwww.nasa.gov%2Fhistory%2Fexplorer-1-overview%2F\" aria-label=\"Share on Facebook.\">\n\t\t\t\t\t\t\t\t<svg 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href=\"\/feed\/\" aria-label=\"Subscribe to RSS feed.\">\n\t\t\t\t\t\t\t\t<svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 800 800\" aria-hidden=\"true\"><path d=\"M493 652H392c0-134-111-244-244-244V307c189 0 345 156 345 345zm71 0c0-228-188-416-416-416V132c285 0 520 235 520 520z\"\/><circle cx=\"219\" cy=\"581\" r=\"71\"\/><\/svg>\n\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/li>\n\t\t\t\t\t<\/ul>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\t\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\">\n\t\t\t<div class=\"padding-top-3 border-top-1px border-color-carbon-black\">\n\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t<h2 class=\"heading-14\">Details<\/h2>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"grid-row margin-bottom-3\">\n\t\t\t\t\t<div class=\"grid-col-4\">\n\t\t\t\t\t\t<div class=\"subheading\">Last Updated<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"grid-col-8\">Aug 21, 2023<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t<div class=\"grid-col-12 desktop:grid-col-5 padding-right-4 margin-bottom-5 desktop:margin-bottom-0\"><div class=\"padding-top-3 border-top-1px border-color-carbon-black \"><div class=\"margin-bottom-2\"><h2 class=\"heading-14\">Related Terms<\/h2><\/div><ul class=\"article-tags\"><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/history\/\">NASA History<\/a><\/li><li class=\"article-tag\"><a href=\"https:\/\/www.nasa.gov\/mission\/explorer-1\/\">Explorer<\/a><\/li><\/ul><\/div><\/div>\n\t<\/div>\n<\/section>\n\t<\/div>\n\n<div id=\"\" class=\"nasa-gb-align-full width-full maxw-full padding-x-3 padding-y-0 hds-module hds-module-full wp-block-nasa-blocks-related-articles\">\t\t<section class=\"hds-related-articles padding-x-0 padding-y-3 desktop:padding-top-7 desktop:padding-bottom-9\">\n\t\t\t<div class=\"w-100 grid-row grid-container maxw-widescreen padding-0 text-align-left\">\n\t\t\t\t<div class=\"margin-bottom-4\"><h2 style=\"max-width: 100%;\" class=\"width-full w-full maxw-full\">Explore More<\/h2><\/div>\n\t\t\t<\/div>\n\t\t\t<div class=\"grid-row grid-container maxw-widescreen padding-0\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/flag-day-2024-one-small-flags-incredible-journey\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"225\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg 1000w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?resize=300,225 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?resize=768,576 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?resize=400,300 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?resize=600,450 600w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/06\/flag-day-2024-11-us-flag-after-demo-2-mission-arrival-1.jpg?resize=900,675 900w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">7 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">Flag Day 2024 \u2013 One Small Flag\u2019s Incredible Journey<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t2 days ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/55-years-ago-manned-orbiting-laboratory-cancellation\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" 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class=\"margin-bottom-1\"><h3 class=\"related-article-title\">55 Years Ago: Manned Orbiting Laboratory Cancellation<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t4 days ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<div class=\"grid-col-12 desktop:grid-col-4 margin-bottom-4 desktop:margin-bottom-0 desktop:padding-right-3\">\n\t\t\t\t\t\t<a href=\"https:\/\/www.nasa.gov\/history\/55-years-ago-star-trek-final-episode-airs-relationship-with-nasa-endures\/\" class=\"color-carbon-black\">\n\t\t\t\t\t\t\t<div class=\"margin-bottom-2\">\n\t\t\t\t\t\t\t\t<div class=\"hds-cover-wrapper cover-hover-zoom bg-carbon-black minh-mobile\">\n\t\t\t\t\t\t\t\t<figure class=\"hds-media-background  \"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"217\" src=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg?w=300\" class=\"attachment-medium size-medium\" alt=\"\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" srcset=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg 800w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg?resize=300,217 300w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg?resize=768,555 768w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg?resize=400,289 400w, https:\/\/www.nasa.gov\/wp-content\/uploads\/2024\/05\/star-trek-final-episode-13-armstrong-at-doohan-farewell-anne-cusack-la-times-2004.jpg?resize=600,434 600w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/figure>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"padding-right-0 desktop:padding-right-10\">\n\t\t\t\t\t\t\t\t<div class=\"subheading margin-bottom-1\">15 min read<\/div>\n\t\t\t\t\t\t\t\t<div class=\"margin-bottom-1\"><h3 class=\"related-article-title\">55 Years Ago: Star Trek Final Episode Airs, Relationship with NASA Endures<\/h3><\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"display-flex flex-align-center label related-article-label margin-bottom-1 color-carbon-60\">\n\t\t\t\t\t\t\t\t\t<span class=\"display-flex flex-align-center margin-right-2\">\n\t\t\t\t\t\t\t\t\t\t<svg version=\"1.1\" class=\"square-2 margin-right-1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" x=\"0px\" y=\"0px\" width=\"16px\" height=\"16px\" viewBox=\"0 0 16 16\" style=\"enable-background:new 0 0 16 16;\" xml:space=\"preserve\"><g><g><path d=\"M8,0C3.5,0-0.1,3.7,0,8.2C0.1,12.5,3.6,16,8,16c4.4,0,8-3.6,8-8C16,3.5,12.4,0,8,0z M8,15.2 C4,15.2,0.8,12,0.8,8C0.8,4,4,0.8,8,0.8c3.9,0,7.2,3.2,7.2,7.1C15.2,11.9,12,15.2,8,15.2z\"\/><path d=\"M5.6,12c0.8-0.8,1.6-1.6,2.4-2.4c0.8,0.8,1.6,1.6,2.4,2.4c0-2.7,0-5.3,0-8C8.8,4,7.2,4,5.6,4 C5.6,6.7,5.6,9.3,5.6,12z\"\/><\/g><\/g><\/svg>\n\t\t\t\t\t\t\t\t\t\t<span>Article<\/span>\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"\">\n\t\t\t\t\t\t\t\t\t\t2 weeks ago\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Explorer 1 was the first satellite launched by the United States when it was sent into space on January 31, 1958. Following the launch of the Soviet Union\u2019s Sputnik 1 on October 4, 1957, the U.S. Army Ballistic Missile Agency was directed to launch a satellite using its Jupiter C rocket developed under the direction […]<\/p>\n","protected":false},"author":214,"featured_media":49202,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[2671,2715],"news-tags":[],"internal-terms":[3902],"coauthors":[],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Explorer 1 Overview","url":"https:\/\/www.nasa.gov\/history\/explorer-1-overview\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/history\/explorer-1-overview\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg"},"articleSection":"NASA History","author":[{"@type":"Person","name":"Sarah A. Loff"}],"creator":["Sarah A. Loff"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["Missions","Explorer","NASA History"],"dateCreated":"2015-03-18T19:22:18Z","datePublished":"2015-03-18T19:22:18Z","dateModified":"2023-08-21T16:20:12Z"},"rendered":"<meta name=\"parsely-title\" content=\"Explorer 1 Overview\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/history\/explorer-1-overview\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2015-03-18T19:22:18Z\" \/>\n<meta name=\"parsely-section\" content=\"NASA History\" \/>\n<meta name=\"parsely-tags\" content=\"Missions,Explorer,NASA History\" \/>\n<meta name=\"parsely-author\" content=\"Sarah A. Loff\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":2,"time_ago":"9 years","featured_image":{"id":49202,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2015\/03\/1958_january_explorer_01_team_0.jpg","title":"1958_january_explorer_01_team_0","alt":"","caption":""},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/41086"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/214"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=41086"}],"version-history":[{"count":2,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/41086\/revisions"}],"predecessor-version":[{"id":469120,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/41086\/revisions\/469120"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/49202"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=41086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=41086"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=41086"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=41086"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=41086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}