Across
- 4. Very young star.
- 5. Cloud of dust and gas.
- 8. An object's spinning motion about its own axis.
- 10. An object's orbital motion around another object.
- 11. Force that draws objects near a planet's center.
Down
- 1. A point of infinite mass density.
- 2. Very bright and large star.
- 3. An uncharged particle with little mass.
- 4. Celestial body that orbits a star.
- 6. The study of the universe.
- 7. Self luminous body of gas.
- 9. Spinning neutron stars.