The Universe part 1

1. high-powered ____ like the Hubble is another tool for seeing far into space.
7. clouds of dust and gas. Plural form.
8. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
9. type of galaxy that we are in.
11. mathematical measurements can be used to determine if a planet is ____ around a distant star.
12. when the iron in large stars causes it to explode, it becomes this.
14. when all of the fuel of a small star is used and does not shine any longer it is called this. (2 words)
15. the beginning of a star.
18. a Doppler shift toward longer wavelenths of an object moving outward at increasing rates of speed, suggesting that the universe is expanding. (2 words)
20. two pulsating stars that are more than 65 billion light years from Earth.
21. after a star becomes a supernova, it either becomes a ___ star or a black hole.
22. massive objects larger than our solar system that give off huge amounts of energy and reside in galaxies that have black holes.

2. the center of a black hole where matter is crushed to infinite density because the pull of gravity is infinitely strong.
3. type of black hole that has been detected at the center of many galaxies.
4. _____ effect is an apparent shift in the frequency of a wave of electromagnetic radiation due to relative motion between the source of radiation and the observer.
5. about 10% of stars are made of this.
6. the distance light travels in a year at the rate of 186,000 miles per second. (2 words)
10. system consisting of a solitary star not gravitationally bound to other stars. (2 words)
13. small rocky bodies that orbit or travel around the sun.
16. all of space and time and their contents
17. large natural objects that orbit, or travel around stars.
19. a huge burning sphere of gas,