Universe

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Across
  1. 1. A young star in its early stage of life
  2. 3. The unit used to measure temperature
  3. 4. A cloud of dust and gas
  4. 7. A type of galaxy that is shaped like an oval, and contains many old stars
  5. 8. Brightness of a celestial object
Down
  1. 2. A type of galaxy that has arms that curve out from a central bulge
  2. 5. The theory that the universe all started from a single point, exploded, and is constantly expanding outwards
  3. 6. A type of galaxy that does not have a distinct shape, and contains a lot of gas and dust