Across
- 2. the death of a star by a tremendous explosion which releases huge amounts of energy
- 4. a flattened disk of stars with spiral arms and a central bulge that contains both young and old stars
- 6. where stars spend most of their active life fusing hydrogen to helium and form the diagonal pattern down the center of the H-R diagram
- 11. group of stars that have an irregular structure and do not fit into the other categories
- 14. Diagram Hertzsprung-Russel diagram; a graph that shows the relationship between a stars temperature and absolute magnitude
- 17. groups of stars within galaxies
- 18. range of wavelengths; can be used to detect heat
- 20. the entire range of electromagnetic waves including radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, gamma rays, and cosmic rays
- 23. an instrument used to observe light waves from the electromagnetic spectrum
- 24. a large group of stars in space
- 25. theory that states that the universe began with a tremendous explosion approximately 15 billion years ago
- 26. huge bright ball of gas and dust in space
Down
- 1. the next stage in a stars life cycle after a white dwarf when the star has "burned out" and no longer shines blackhole final stage in the evolution of a very massive star, where the core's mass collapses to a point that its gravity is so strong that not even light can escape
- 3. a star that expands and cools once it runs out of hydrogen
- 5. a ring-shaped nebula formed by an expanding shell of gas around an aging star; occurs when a star "dies"
- 7. a star like source of light that is extremely far away and one of the most powerful sources of energy in the universe
- 8. a large cloud of dust and gas in space where new stars are formed
- 9. measure of a stars brightness as seen by an observer on Earth
- 10. shortest wavelength on the (EM) spectrum; carry the most energy of any wave
- 12. a shift in the spectra of very distant galaxies toward longer wavelengths
- 13. a star that forms after a supernova in which nearly all the particles have become neutrons
- 15. massive groups of old stars that look like spheres or elongated oval shapes with bright centers
- 16. all space and matter that space contains
- 19. the system composed of the sub (a star) and the planets and other bodies that travel around the sun
- 21. relative quantity or brightness of light
- 22. a spinning neutron star that emits rapid pulses of light