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| August 24, 1961
| In orbit
| Micrometeoroids and energetic particle studies, first satellite to measure Earth's climate<ref>{{cite web |url=https://www.ssec.wisc.edu/media/spotlight/explorer7.html |title=50 Year Anniversary of Explorer 7 Launch |publisher=Ssec.wisc.edu |access-date=2018-04-20 |archive-date=10 June 2017 |archive-url=https://web.archive.org/web/20170610094052/http://www.ssec.wisc.edu/media/spotlight/explorer7.html |url-status=dead }}</ref><ref>{{cite web|last=Evans |first=Gareth |url=https://www.aerospace-technology.com/features/feature78185/ |title=Nasa's High-Tech Climate Monitoring |publisher=Aerospace Technology |date=2010-04-05 |access-date=2018-04-20}}</ref><ref>{{cite web |url=https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1959-009A |title=NASA - NSSDCA - Spacecraft - Details |publisher=National Space Science Data Center |access-date=2018-04-20 }}</ref>
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