THE BEGINNING

123456789
Across
  1. 4. one of the two theories about the origin of the Earth
  2. 7. capability of being inhabited
  3. 8. a hard outer layer of something
  4. 9. a region around a magnetic material within which the force of magnetism acts.
Down
  1. 1. a planet outside the solar system
  2. 2. the center or most important part of something
  3. 3. the force that attracts a body toward its center
  4. 5. also known as "Geosphere"
  5. 6. the Greek word for "life"
  6. 7. an online database of potentially habitable worlds discoveries; an acronym