Across
- 5. a diagram that shows the relationship between the brightness, surface temperature, and color of stars
- 6. total amount of light (energy) emitted by a star or other celestial body
- 8. a scientific theory concerning the early development and shape of the universe from a dense state, which began and is still expanding
- 10. the measure of the observed visible brightness of a star
Down
- 1. the galaxy which contains our Sun and its solar system, including Earth
- 2. a region in space where gravity is so strong that even light cannot escape
- 3. observations of galaxies moving away from each other and our own Milky Way galaxy
- 4. clouds of dust and gas; site of star formation; remains of dead or dying stars
- 7. luminous globe of gas which produces its own heat and light by nuclear reaction made of mostly hydrogen and helium gas
- 9. a system of stars and associated matter heled together by gravitational attraction