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Across 5. A star in its earliest stage of life. 6. A rapidly spinning neutron star that produces radio waves. 8. An enormously bright, distant galaxy with a giant black hole at its center. 10. A huge group of single stars, star systems, star clusters, dust and gas bound together by gravity. 14. Uses powers of ten to write very large or very small numbers in a shorter form. 15. These stars are only about 20km in diameter. 17. An extremely large, but fairly cool star. 19. Betelgeuse is a ___ star. 22. A large cloud of gas and dust in the universe which gives birth to stars. 23. Device that breaks up light from elements into colors and produces an image like a rainbow. 24. "The Hunter" 25. The distance light travels in one year.

Down 1. The apparent change in positions of an object when you look at it from different places. 2. This diagram shows the relationships between color, temperature, and absolute brightness of stars. 3. Our galaxy. 4. Our sun is one. 7. The brilliant explosion of a dying supergiant star. 9. Imaginary pattern of stars. 11. The ___ of a star depends on its temperature. 12. What is left behind when a low-mass or medium-mass star dies. 13. Most of the known stars fall along this in the H-R diagram. 16. The small, dense remains of a high-mass star after a supernova. 18. An object in space with gravity so intense even light cannot escape. 20. ____ brightness is how bright a star is measured from a standard distance away. 21. ___ brightness is how bright a star looks from Earth.