Across
- 4. a very dense compact star comprised primarily of neutrons
- 10. the time a star remains fusing hydrogen and helium in its core
- 15. a dense star whose radius is practical the same as earth but whose mass is comparable to the sun
- 17. a cloud of gas and dust between the stars
- 18. the force exerted by a substance such as gas on an area divided by that area
- 22. the visible surface of the sun
- 23. a cool luminous star whose radius is much larger than the sun
- 25. an object whose escape velocity equals the speed of light
- 26. an aging giant star that has consumed its core's supply of hydrogen fuel
- 28. the outflow of low-density hot gas from the suns upper atmosphere
Down
- 1. the region immediately below the surface of the sun
- 2. a star still in its formation stage
- 3. the binding of two light nuclei to form a heavier nucleus
- 5. a sudden increase in brightness of a small region on the sun
- 6. the eclectic change in solar activity
- 7. a star whose luminosity changes over time
- 8. a star that has a mass too low to begin nuclear fusion
- 9. the outer hotter part of the sun
- 11. the lower part of the sun's outer atmosphere
- 12. an explosion that occurs at the end of some stars evolutionary period
- 13. a graph on which stars are located according to temperature and luminosity
- 14. the amount of energy radiated by a body per second
- 16. the region inside the star where its energy is carried outside by radiation
- 19. a shell of gas ejected by a low mass star late in its lifetime
- 20. the condition in which pressure and gravitational forces in a star are balanced
- 21. extremely energetic particles traveling at the speed of light
- 22. the shift in an object's position caused by the observer's motion
- 24. a small, old, relatively cool star.
- 27. equal to 3.26 light-years