beond the stars and other solar systems

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Across
  1. 5. The closest large spiral galaxy to our own.
  2. 7. 1: The first human-made spacecraft to enter interstellar space.
  3. 9. Centauri: The closest individual star to our solar system.
Down
  1. 1. A giant cloud of dust and gas in space.
  2. 2. Hole: A region where gravity prevents even light from escaping.
  3. 3. Matter: Invisible material making up most of the universe's mass.
  4. 4. The powerful and luminous explosion of a dying star.
  5. 6. A planet that orbits a star outside our solar system.
  6. 8. Way: The barred spiral galaxy containing our solar system.