Across
- 2. The mean distance from the center of the Earth to the center of the Sun.
- 4. the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets
- 5. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
- 6. A part of space with a gravitational pull so strong that no matter or light can escape.
- 7. all the space, time, matter, and energy that exists
- 10. A galaxy in the shape of a squashed circle.
- 11. the distance that light travels in one year
- 15. a gigantic explosion of a very massive star
Down
- 1. Information and data that either supports or goes against a claim.
- 3. large spiral system consisting of several hundred billion stars, one of which is the Sun
- 8. well-tested explanation of scientific observations and experiments
- 9. The force that keeps you on the ground on Earth.
- 12. ___meter, ___gram, ___second, etc.
- 13. a large cloud of gas and dust in space
- 14. Millions or billions of stars mixed with gas and dust held together by gravitational attraction.