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[[File:Pointing X-ray Eyes at our Resident Supermassive Black Hole.jpg|thumb|upright=1.0|right|An Explorer mission observes [[Sagittarius A*|center]]
The '''Explorers program'''<ref>{{cite web |title=Explorers Program |url=https://explorers.gsfc.nasa.gov/ |website=Explorers Program Home Page at NASA Goddard |publisher=NASA |access-date=3 May 2022}}</ref> is a [[NASA]] exploration program that provides flight opportunities for physics, [[geophysics]], [[heliophysics]], and [[astrophysics]] investigations from space. Launched in 1958, [[Explorer 1]] was the first spacecraft of the United States to achieve orbit. Over 90 space missions have been launched since. Starting with [[Explorer 6]], it has been operated by NASA, with regular collaboration with a variety of other institutions, including many international partners.
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