Cassiopeia A (Cas A) is the remnant of a massive star that exploded about 300 years ago. Source: NASA/CXC/SAO [1200x1200] via /r/spaceporn http://bit.ly/2H00Pb4
via Tumblr http://bit.ly/2TqY4AT
Cassiopeia A (Cas A) is the remnant of a massive star that exploded about 300 years ago. Source: NASA/CXC/SAO [1200x1200] via /r/spaceporn http://bit.ly/2H00Pb4
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