The Colliding
Spiral Galaxies of Arp 274 Credit:
NASA,
ESA,
M. Livio
(STScI) and the
Hubble Heritage Team (STScI/AURA)
Explanation: Two galaxies are squaring off in Virgo
and here are the latest pictures. When two
galaxies collide, the stars that compose them usually do
not. This is because
galaxies are
mostly empty space and, however bright, stars only take up only
a small fraction of that space. But during the
collision, one galaxy can rip the other apart
gravitationally, and dust and gas common to both galaxies does
collide. If the two
galaxies
merge, black holes that likely resided in each galaxy center
may
eventually merge. Because the distances are so large, the
whole thing
takes place in slow motion -- over hundreds of millions of
years. Besides the two
large
spiral galaxies, a smaller third galaxy is visible on the
far left of the
above image of Arp 274, also known as NGC 5679. Arp 274
spans about 200,000
light years across and lies about 400 million light years
away toward the
constellation of Virgo.
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