The Universe

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Across
  1. 5. Galaxy with an undefined shape.
  2. 6. Body composed of ice, rock and dust that orbits the Sun.
  3. 7. Gas sphere that produces light and heat through nuclear reactions in its core.
  4. 8. Rocky body that moves around the Sun.
Down
  1. 1. Event at the beginning of the universe.
  2. 2. Science that studies the origin and evolution of the universe.
  3. 3. Rocky body that orbits a planet.
  4. 4. Huge cloud of hydrogen, helium and dust.
  5. 6. A group of galaxies, such as the Local Group.