Across
- 2. Is a huge, rotating collection of gas, dust and billions of stars, planets and other celestial objects
- 3. Jupiter, Saturn, Uranus, Neptune are the outer planets called the ______ ________ as they are mainly composed of gases and liquids
- 4. Meaning they produce and emit their own light
- 5. Are large celestial objects that revolve around a star and are non-luminous
- 10. The study of the universe
- 11. Mercury, Venus, Earth, Mars are the inner planets called the _________ ________ as they have a solid rocky core
- 12. Consists of the sun and all celestial objects that revolve around it (planets, moons, asteroids, comets)
- 13. Is everything that exists, including all energy, matter and space
Down
- 1. Any object in space
- 6. Is a celestial object that revolves around a planet in a closed path or orbit
- 7. Reflect but does not emit light
- 8. Is the branch of science that studies objects beyond the earth
- 9. They are massive collections of gas held together by their own gravity and emitting huge amounts of energy