Across
- 7. the electromagnetic radiation left over from the big bang
- 9. anything that has mass and takes up space
- 11. a law that states that the farther away a galaxy is, the faster it is moving away from us
- 12. A mysterious force that appears to be causing the expansion of the universe to accelerate
- 13. one of the small asteroid-like bodies that formed the building block of the planets
Down
- 1. what something is made up of
- 2. the amount of space that an object occupies
- 3. a large body in space that orbits a star and does not produce light on its own
- 4. space and all the matter in it
- 5. the distance that light travels in one year, about 9.5 trillion kilometers
- 6. a huge drop of single stars, star systems, star clusters, dust, and gas bound together by gravity
- 8. matter that does not give off electromagnetic radiation but appears to be quite abundant in the universe
- 10. the theory that the universe originated in a huge explosion that released all matter and energy