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Probing the structure and evolution of our Universe and the objects its contains requires, in general, that we make our observations above Earth's absorbing atmosphere. Starting with sounding rocket flights in the late 1940s, scientists have been able to develop ever-better instruments to probe deeper into space and finer into the details of our cosmos. This section will allow you to learn about the satellites and missions which have provided scientists the foundation of "what we know".

* Tell Me about X-ray Astronomy Satellites & Missions
* Tell Me about Gamma-ray Astronomy Satellites & Missions
* Satellite Showcase


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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