Fig11_12 Cassiopeia A x-ray

Fig11_12 Cassiopeia A x-ray

Fig. 11.12 . The expanding supernova remnant Cassiopeia A has a temperature of about 30 million K, and is therefore a luminous x-ray source seen in this image from the Chandra X-ray Observatory. Still visible in x-rays, the tiny point-like source near the center of Cas A is a neutron star, the collapsed core of the star that exploded about 330 years ago, as observed from Earth, and gave rise to the expanding debris. (Courtesy of NASA/CXC/MIT/U. Mass. Amherst/M. S. Stage et al.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University