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What is a galaxy?

What is a galaxy? Here are some definitions.

Noun
  1. (now rare) The Milky Way; the apparent band of concentrated stars which appears in the night sky over earth. [from 14th c.]
  2. (astronomy) Any of the collections of many millions or billions of stars, galactic dust, black holes, etc. existing as independent and coherent systems, of which there are billions in the known universe. [from 19th c.]
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In essence the galaxy is eclipsing the quasar, but paradoxically its gravitational lens effect brightens the light received from the latter.
The galaxy's hallmark is a brilliant white, bulbous core encircled by the thick dust lanes comprising the spiral structure of the galaxy.
You just don't get giant rotating disks from the accretion of small galaxy fragments.
Astronomers discovered through CGRO data that the center of our galaxy glows in gamma rays created by the annihilation of matter and antimatter.
At those rates, each galaxy could easily have formed the quasar and its black hole power source in just a few hundred million years.
When she observed the galaxy later using the radio telescope, she found that it is embedded in a huge disk of atomic hydrogen gas.

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