The image, made by NASA's Hubble Space Telescope, shows the
Whirlpool Galaxy (also known as M51 and NGC 5194) in the optical
waveband.
The image, made by NASA's Chandra X-ray Observatory,
shows the same galaxy in the x-ray waveband. The bright point sources in
the Chandra image correspond to binary stars made up of neutron stars
or black holes that are sucking material away from their companion
stars. The diffuse emission in Chandra image comes from interstellar
plasma that has been superheated by supernova explosions. More info.
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