Across
- 4. it atmosphere is mainly hydrogen and helium
- 5. has a thin atmosphere-95 percent carbon dioxid and 0.15 percent oxygen
- 6. A red star is cooler than this star
- 10. earth centered solar system
- 11. the sun and planets formed together from a cloud of dust
Down
- 1. groups of stars that have regularly recognized positions
- 2. sun centered solar system
- 3. gaseous, low-density worlds
- 7. the brightness as it appears to us
- 8. the intrinsic brightness, independent of how bright it appears
- 9. has a very dense atmosphere, made up of mostly carbon dioxide