White Dwarf

White Dwarf

Composite of a supernova's remnants

This composite of images from NASA's Chandra X-ray Observatory shows the remnant of Kepler's supernova in low-energy (red), intermediate-energy (green) and high-energy (blue) X-rays. The background is an optical star field taken from the Digitized Sky Survey. The distance to the object is uncertain, with estimates ranging from 13,000 to 23,000 light-years, but recent studies favor the maximum range. This image spans 12 arcminutes, or about 80 light-years at the greatest distance. 

Image: NASA/CXC/NCSU/M.Burkey et al.; optical: DSS