Across
- 4. The motion of stars as it appears from Earth, caused by the movement of Earth
- 6. Large explosions that occur as pressure begins to build when gases accumulate around a white dwarf
- 7. Formed when nebulas collapse to form groups of hundreds or thousands of stars
- 9. A cloud of gas and dust in space
- 11. The name of the stars whose shell of gases have grown cooler as they expand and become reddish in color
- 14. The apparent shift in a star's position when viewed from different locations
- 15. The true brightness, or ____________ magnitude, of a star is how bright the star would appear if all the stars were at a uniform distance from Earth
- 17. The most common element in stars
- 19. The ___________ of a star depends on its brightness and its distance from Earth
- 20. A hot, extremely dense core of matter that remains when the matter of a medium-sized star collapses until it cannot be press further together
Down
- 1. Created when the core of massive stars compact so greatly because of the gravitational force of its large mass that not even light can escape its gravity
- 2. A ball of gases that gives off a tremendous amount of electromagnetic energy
- 3. Pairs of stars that revolve around each other and are held together by gravity
- 5. A process that occurs when extremely high temperature and pressure cause less-massive atomic nuclei to combine to form more-massive nuclei and release enormous amounts of energy
- 8. The distance that light travels in one year
- 10. A neutron star that emits a beam of radio waves that sweeps across space
- 12. The brightness of a star as it appears to us on Earth is called the star's _____________ magnitude
- 13. A large-scale group of stars, gas, and dust that is bound together by gravity
- 16. The name of the North Star
- 18. Groups of stars organized in a recognizable pattern