Astronomy

1234567
Across
  1. 4. Day and night are the main consequences.
  2. 6. A type of planets named for its rocky surface.
  3. 7. The coldest atmospheric layer.
Down
  1. 1. A type of planets named for its system rings, moons and low density.
  2. 2. This causes the four seasons.
  3. 3. It regulates the temperature and protects us from solar radiation.
  4. 5. Theory of our galaxy.