Explorer 11 photograph

Explorer 11

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Launch dateApril 27, 1961, 4:16 PM GMT+2
Inclination28. 9°
RocketJuno II
ManufacturersNASA Goddard Space Flight Center
Launch siteLaunch Complex 26A
Date of Reg.
Date of Upd.
ID1515424
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About Explorer 11


Explorer 11 was an American Earth-orbital satellite that carried the first space-borne gamma-ray telescope. This was the earliest beginning of space gamma-ray astronomy. Launched on April 27, 1961 by a Juno II rocket, the satellite returned data until November 17, when power supply problems ended the science mission.

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