Planets and Orbit

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Across
  1. 2. All matter, energy, and space, including all galaxies and the contents of intergalactic space.
  2. 3. The path that an object in space takes as it revolves around another object, such as a planet orbiting a star.
  3. 5. The force that attracts objects with mass toward one another.
  4. 8. system: The collection of planets and other objects that orbit the sun.
  5. 9. An object that orbits a planet or other celestial body.
Down
  1. 1. A celestial body that orbits a star, is spherical in shape, and has cleared its orbit of other debris.
  2. 4. hole: A region of space with a gravitational pull so strong that nothing, not even light, can escape from it.
  3. 5. A vast collection of stars, dust, and gas held together by gravity.
  4. 6. A celestial object composed of ice, dust, and gas that forms a tail as it approaches the sun.
  5. 7. A small, rocky object that orbits the sun.