Across
- 2. The force that causes objects with mass to attract one another
- 3. A theory that says the universe began as a small point that expanded rapidly about 13.7 billion years ago.
- 7. Large and small rocks or metallic masses orbiting the Sun; made up of materials similar to that which formed the planets
- 8. The luminous star around which Earth and other planets revolve; composed mainly of hydrogen and helium
- 9. A large celestial body that revolves around a star in a solar system
- 10. A curved path followed by a satellite as it revolves around an object
- 11. A celestial body that revolves around a planet
Down
- 1. The attraction between two objects due to the invisible force of gravity; the gravitational pull from the Moon is primarily responsible for the tides that form on Earth
- 4. A state of matter with indefinite volume and shape
- 5. Tiny particles of matter floating in space; condense under gravity to form stars and planets
- 6. A large grouping of stars in space
- 8. System, A star and the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it