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NASA/CXC/SAO 
Cassiopeia A Supernova Remnant 
2017, 27 December (published) 
  
Colour image 
NASA 
 
LL/117298 
  
Cassiopeia A (Cas A) is the remnant of a massive star that exploded about 300 years ago. The X-ray image shows an expanding shell of hot gas produced by the explosion. 
 

 
  
 
  
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