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'Herculean' 2.5-billion-pixel mosaic shows our closest galactic neighbor like never before — and took more than a decade to create
Astronomers believe the galaxy once collided with one of its current satellite galaxies, Messier 32, and likely stole most of the latter's stars in the process. This means that comparing the ...
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Panorama of Andromeda galaxy unveils hundreds of millions of stars
A possible culprit is the compact satellite galaxy Messier 32, which resembles the stripped-down core of a once-spiral galaxy that may have interacted with Andromeda in the past. Computer ...