
Cassiopeia A (Cas A) is a supernova remnant located about 11,000 light-years from Earth in the constellation Cassiopeia. It spans approximately 10 light-years. via NASA https://ift.tt/6M5DhCw
The four-member Crew Health and Performance Exploration Analog (CHAPEA) crew poses outside for the first time in more than a year following ...
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