Across
- 2. distance light travels in one year - about 9.5 trillion km.
- 5. section of the H-R diagram that is plotted from the upper left to the lower right and constians 90 percent of all known stars.
- 6. late 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.
- 7. a region in space that is so dense that nothing can escape its inward pull of gravity.
- 8. telescope that collects and magnifies radio waves.
- 9. spiral galaxy that is about 100,00 light-years in diameter and contains from 200 to 400 billion stars, including the sun.
- 13. large group of stars, dust, and gas held together by gravity.
- 15. layer of the Sun that emits light into space.
- 16. giant star that has lost its outer layers, leaving behind a hot, dense core that continues to contract under gravity.
Down
- 1. interstellar cloud of gas, ice and dust.
- 3. star pattern that appears to form images, is used by astronomers to locate and name stars, and often is named for a mythological figure.
- 4. produced by a collapsing star when protons and electrons in the star’s core collide to form neutrons.
- 10. group of about 50 galaxies including the Milky Way.
- 11. darker, cooler areas of the Sun’s photosphere.
- 12. device that disperses light into its component wavelengths, using a prism or diffraction grating.
- 14. gigantic explosion of a star in which the temperature within the collapsing star reaches 10 billion K, can evelole into a neutron star.