The concepts up for further review are the Advanced X-ray Imaging Satellite and the Probe far-Infrared Mission for Astrophysics.
The Explorers Program is not the only testing ground for new NASA missions.
Even the mission concepts that did not end up getting selected by NASA make for great reading.
An artist’s concept of the Swift Observatory, on whose work one of the new mission concepts would build.Illustration: NASA
It may have just not been their timeyet.
you’ve got the option to read about some of those rejected missionshere.
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