unit one vocab review

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