space

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Across
  1. 1. The planet right after Earth.
  2. 4. A free satellite orbiting the Earth.
  3. 5. A little star in space.
  4. 6. It is a large space structure built in Earth's orbit, where people live semi-permanently and conduct space experiments or space observations.
  5. 8. An infinite amount of space visible above the horizon or horizon.
  6. 11. Theories of the Universe
  7. 12. The eight spheres of the solar system.
  8. 13. Earth revolving around the sun.
Down
  1. 1. Stone objects in space.
  2. 2. The action of the Earth revolving around its axis.
  3. 3. A group of eight planets.
  4. 6. A self-illuminating object.
  5. 7. The star at the center of the solar system.
  6. 9. The rotation of the earth in a regular cycle.
  7. 10. Named after the stars in the sky.