Unit 1

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Across
  1. 4. First Law, The law stating that the planets move in elliptical orbits with the sun at one focus
  2. 5. The entirety of space, time, matter, and energy, including all planets, stars, galaxies, and other celestial bodies
  3. 7. A system of millions or billions of stars, along with gas and dust, held together by gravitational attraction
  4. 9. The belief that the earth is the center of the universe
  5. 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 amount of matter in an object
  2. 2. energy, Energy from the Sun that is converted into thermal or electrical energy
  3. 3. the belief that the sun is the center of the universe
  4. 6. System, A collection of planets, moons, asteroids, comets, and other celestial bodies that orbit around a star, the sun
  5. 8. An imaginary line around which celestial body, such as a planet, rotates