Unit 1 vocab crossword puzzle

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Across
  1. 5. The spinning of a celestial body, such as a planet, around its axis.
  2. 8. The motion of a celestial body, such as a planet, around another celestial body, such as a star.
  3. 9. A system of millions or billions of stars, along with gas and dust, held together by gravitational attraction.
  4. 10. An imaginary line around which a celestial body, such as a planet, rotates.
Down
  1. 1. A celestial body that orbits around a star, is spherical in shape, and has cleared its orbit of other debris.
  2. 2. The curved path followed by a celestial body, such as a planet, around another celestial body, such as a star.
  3. 3. The force of attraction between two objects due to their mass.
  4. 4. The entirety of space, time, matter, and energy, including all planets, stars, galaxies, and other celestial bodies.
  5. 6. A collection of planets, moons, asteroids, comets, and other celestial bodies that orbit around a star, the Sun.
  6. 7. The amount of matter in an object.