Across
- 2. Planet closest to the Sun
- 4. The event that describes the beginning of the universe
- 5. A region of spacetime where gravity is so strong that nothing can escape
- 7. The next phase from a main sequence star
- 9. Group of planets that orbit outside the astroid belt
- 10. The largest planet in the solar system
- 11. Recently categorized as a dwarf planet
- 14. A rocky celestial body orbiting the sun
- 16. Planet farthest from the Sun
- 17. The rotation of Uranus and Venus
- 19. The remnant from a dying star
- 20. The first phase of the moon after new moon
Down
- 1. Colossal explosion of stars
- 3. The largest moon of Saturn
- 6. Nursery of stars
- 8. A cosmic snowball
- 12. Tide created when the Moon, Earth, and Sun fall in a straight line
- 13. A group of stars that appears to form a pattern
- 15. The collapsed core of a massive supergiant star
- 18. The only known planet that sustains life