Space

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Across
  1. 2. A ball burning of gases, plasma and hydrogen
  2. 4. A moon of Jupiter, also largest moon discovered
  3. 6. A cloud of gas and dust, forming amazing sights
  4. 7. A star that spins up to 700 times per second
Down
  1. 1. Gravity so extreme that light cannot escape
  2. 3. The name of our galaxy, also on a chocolate
  3. 5. The last gas giant in our solar system