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Across 2. What is left behind when a low-mass or medium-mass star dies. 5. ___ brightness is how bright a star looks from Earth. 7. Uses powers of ten to write very large or very small numbers in a shorter form. 9. A star in its earliest stage of life. 12. These stars are only about 20km in diameter. 13. Our sun is one. 14. A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity. 18. An extremely large, but fairly cool star. 20. A rapidly spinning neutron star that produces radio waves. 21. Imaginary pattern of stars. 23. ____ brightness is how bright a star is measured from a standard distance away. 24. Our galaxy. 25. The apparent change in positions of an object when you look at it from different places.

Down 1. The small, dense remains of a high-mass star after a supernova. 3. Device that breaks up light from elements into colors and produces an image like a rainbow. 4. This diagram shows the relationships between color, temperature, and absolute brightness of stars. 6. Most of the known stars fall along this in the H-R diagram. 8. "The Hunter" 10. The ___ of a star depends on its temperature. 11. An enormously bright, distant galaxy with a giant black hole at its center. 15. Betelgeuse is a ___ star. 16. An object in space with gravity so intense even light cannot escape. 17. The brilliant explosion of a dying supergiant star. 19. The distance light travels in one year. 22. A large cloud of gas and dust in the universe which gives birth to stars.