Across
- 2. type of star that alternately increases and decreases in size usually with corresponding changes in brightness.
- 3. Greek word gala means.
- 7. type of black hole formed when massive stars use up all their fuel and die.
- 8. another name for universe.
- 10. ____ fusion is the process by which gas clouds get so hot it begins to form a star.
- 14. tool that allows the different wavelengths and colors of light to be seen with the human eye.
- 17. another type of galaxy other than spiral, irregular, and peculiar.
- 18. the phenomenon by means of which bodies having mass are attracted to one another.
- 19. celestial objects made out of frozen gases, rock and dust that orbit the Sun.
- 20. About 90% of stars are made of this.
- 21. natural objects that orbit planets
- 23. when the fuel of a smaller star begins to be used up, it is called this. (2 words)
- 24. _____ sensing is the science of gathering data on an object or area from a considerable distance.
Down
- 1. two stars that appear as one to the naked eye (2 words)
- 4. when the largest stars explode, they collapse under the pressure of tremendous gravity and become this. (2 words)
- 5. another name for asteroids.
- 6. the name of our galaxy (2 words)
- 9. the middle-aged, middle-size star in our solar system.
- 11. in larger stars nuclear fusion eventually causes this to form in the star.
- 12. ____ 1 is the first human-made spacecraft designed to leave our solar system.
- 13. a star with planets orbiting around it (2 words)
- 15. the donut-shaped zone of no return on a black hole (2 words).
- 16. the fourth state of matter
- 22. type of matter that cannot be seen but has a gravitational effect on objects nearby.