File:PIA20061 - Andromeda in High-Energy X-rays, Figure 1.jpg

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Description	English: NASA's Nuclear Spectroscope Telescope Array, or NuSTAR, has imaged a swath of the Andromeda galaxy -- the nearest large galaxy to our own Milky Way galaxy. NuSTAR's view (inset) shows high-energy X-rays coming mostly from X-ray binaries, which are pairs of stars in which one "dead" member feeds off its companion. The dead member of the pair is either a black hole or neutron star. NuSTAR can pick up even the faintest of these objects, providing a better understanding of their population, as a whole, in Andromeda. The findings ultimately help astronomers gather clues about similar objects in the very distant universe. The background image of Andromeda was taken by NASA's Galaxy Evolution Explorer in ultraviolet light. Andromeda is a spiral galaxy like our Milky Way but larger in size. It lies 2.5 million light-years away in the Andromeda constellation.
Date	5 January 2016 (released)
Source	https://photojournal.jpl.nasa.gov/catalog/PIA20061 / http://photojournal.jpl.nasa.gov/figures/PIA20061_fig1.jpg
Author	NASA/JPL-Caltech/GSFC

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Image title	At approximately 2.5 million light-years away, the Andromeda Galaxy, or M31, is our Milky Way's largest galactic neighbor. The entire galaxy spans 260,000 light-years across - a distance so large, it took 10 GALEX images stitched together to produce this view of the galaxy next door. The wisps of blue making up the galaxy's spiral arms are neighborhoods that harbor hot, young, massive stars. Meanwhile, the central orange-white ball reveals a congregation of cooler, old stars that formed long ago. Andromeda is so bright and close by that it is one of only three galaxies that can be spotted from Earth with the naked eye. This view is two-color composite, where blue represents far-ultraviolet light, and red is near-ultraviolet light.
Headline	At approximately 2.5 million light-years away, the Andromeda Galaxy, or M31, is our Milky Way's largest galactic neighbor. The entire galaxy spans 260,000 light-years across - a distance so large, it took 10 GALEX images stitched together to produce this
Credit/Provider	NASA/JPL-Caltech
Source	Galaxy Evolution Explorer
Short title	Andromeda, the Galaxy Next Door
Date and time of data generation	00:00, 21 February 2008
IIM version	2
Keywords	Andromeda Galaxy Messier 31 M31 NGC 224 Messier 32 M32 Messier 110 M110