The Milky Way

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Across
  1. 1. A large collection of stars, gas, and dust bound by gravity.
  2. 5. It holds 100 to 400 billion stars.
  3. 6. A scientist who studies objects beyond Earth's atmosphere.
  4. 7. Found at the centre of most galaxies.
Down
  1. 2. The distance light travels in one year.
  2. 3. A spherical haze of stars that surrounds a galaxy.
  3. 4. An instrument used to study objects beyond the Earth's atmosphere.