Space Systems

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Across
  1. 1. The force that pulls objects toward one another.
  2. 3. angle The angle at which the sun's light hits a surface.
  3. 4. The curved path an object takes around another object in space.
  4. 6. The amount of matter in an object.
  5. 8. noon The time of day when the sun is at its highest point in the sky.
  6. 10. The distance light travels in one year.
  7. 12. The time of day when the sun disappears below the horizon.
  8. 13. The spinning of an object on its axis.
Down
  1. 2. To light something up.
  2. 5. The movement of one object around another, like the Earth around the sun.
  3. 7. brightness How bright a star appears from Earth.
  4. 8. The time of day when the sun appears above the horizon.
  5. 9. The imaginary line an object spins around.
  6. 11. The layer of gases surrounding a planet.