M31, Andromeda Galaxy, Composite

2013 21st century acis advanced ccd imaging spectrometer andromeda galaxy andromeda nebula andromeda astronomy black hole burrell schmidt telescope image celestial body chandra x ray observatory composite image cosmography cosmology cxc deep sky deep space event horizon labeled local galactic group local galaxies group m31 messier 31 ngc 224 point of no return spiral galaxy star formation starburst galaxy stellar mass black hole wide field x ray astronomy x ray detection x ray emission x ray observation