The Evolving Universe

Smithsonian Institution

Cassiopeia A Supernova Remnant

CasA image

Credit: NASA/CXC/MIT/UMass-Amherst

Observers: Michael Stage

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  • Distance from Earth: 11,000 light years
  • Size: 16 light years
  • Telescope: Chandra
  • Light: X-ray (RGB 0.5-1.5, 0.5-0.8, 0.2-0.3 nm)