Across
- 1. group/cluster of about 45 galaxies, including the Milky Way
- 4. surface of the Sun.
- 8. of how the universe began, what it is made of., and how it continues to evolve.
- 9. energy/energy that might be causing accelerated expansion of the universe.
- 10. telescope/optical instrument that uses double convex lenses to concave mirror to collect light and magnify an image.
- 12. stage in a star's life cycle that occurs when its hydrogen fuel is depleted, its core contracts, and its outer layers expand and cool.
- 14. sequence/section of an H-R diagram that is plotted from the upper left to the lower right and contains 90 percent of all known stars.
- 16. pattern that appears to form images, is used by astronomers to locate and name stars, and often is named for a mythological figure.
- 17. telescope/telescope that collects and magnifies radio waves.
Down
- 1. light travels in one year-about 9.5 km
- 2. Bang Theory/the theory that the universe started with a big bang, or explosion, and has been expanding ever since.
- 3. dwarf/giant star that has lost its outer layers, leaving behind a hot, dense core that continues to contract under gravity.
- 5. that disperses light into its component wavelengths, using a prism or diffraction grating
- 6. group of stars, gas, and dust held together by gravity; most commonly can be elliptical, spiral, and irregular.
- 7. matter/unseen mass that adds to the gravity of a galaxy, but cannot be detected or seen.
- 11. telescope/optical instrument that uses double convex lenses to collect light and magnify and image.
- 13. darker areas of the Sun’s photosphere
- 15. mass/is a standard unit of mass in astronomy that is used to indicate the masses of other stars, as well as clusters, nebulae and galaxies.