Astronomy

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Across
  1. 3. A collection of celestial bodies that orbit around a star
  2. 6. The entirety of space, time, matter, and energy, including all planets, stars, and galaxies
  3. 8. Belief the Sun is the center of the Universe
  4. 9. The spinning of a celestial body, such as a planet, around its axis
Down
  1. 1. The amount of matter in an object
  2. 2. A system of billions of stars, comets, and celestial bodies that orbit around a star
  3. 4. The motion of a planet around a star
  4. 5. Belief Earth is the center of the Universe
  5. 7. A celestial body that orbits around a star, spherical in shape, and has cleared its orbit of other debris
  6. 10. An imaginary line around which a celestial body, such as a planet, rotates