Supernova remnant Cassiopeia A in X-ray

by: Nasa/CXC/SAO/Novapix
Reference: a-snv11-00200
Date: 2006-09-06

Cas A is the remnant of a star that exploded about 300 years ago. The X-ray image shows an expanding shell of hot gas produced by the explosion. This gaseous shell is about 10 light years in diameter, and has a temperature of about 50 million degrees.

Contact →