Across
- 2. so dense, even light cannot escape.
- 5. when the Sun plays peek a boo behind the moon.
- 7. solar system with two stars.
- 8. round rock that orbits a planet.
- 10. icy body with long visible vapor trail.
- 12. interstellar cloud of dust and gases.
Down
- 1. aura of plasma observable during eclipse.
- 3. body orbiting a sun, with its own gravity.
- 4. large floating rocks in space.
- 6. distance of annual photon travel.
- 9. gravitationally curved trajectory.
- 11. large bound system of stars.