Across
- 2. a huge sphere of very hot gas that emits light and other radiation.
- 3. a group of 30 or more galaxies.
- 5. it consists of all space, matter, and energy that exists, now, in the past, or in the future.
- 6. a big ball of gas that's orange and gives us light every day.
- 10. he identified the first stars outside the Milky Way.
- 11. the stage after a white dwarf.
- 13. a collection of millions to billions of stars.
Down
- 1. how a star gets energy.
- 2. a big explosion of a star.
- 4. something you can't see without xrays.
- 7. gas and dust a star is formed from.
- 8. leftover "heat" from the big bang.
- 9. a big reddish star late in its life cycle.
- 12. the distance light travels in one year.