Birth of Earth

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Across
  1. 4. gaseous cloud from which in the so called nebular hypothesis of the origin of the solar system, sun, and planets formed by condensation
  2. 5. a substance made of various types of particles that occupies physical space
  3. 6. a force the attracts a body toward any other physical body
  4. 8. an instance of one moving object striking violently against another
  5. 10. a small rocky body orbiting the sun
Down
  1. 1. energy which a body possesses by virtue of being in motion
  2. 2. the emission of energy in the from of ionizing radiation
  3. 3. energy an object possesses because of its position in a gravitational field
  4. 7. the collection of eight planets
  5. 9. the star around which the Earth orbits