Unit 8 Review

4. gravity not only pulls on objects, it can bend ________ as well
5. this is the only type of radiation believed to be capable of escaping a black hole
7. about 68% of the universe is believed to be made of _____ _______
8. this is the visible "edge" of a black hole
9. ____________ is the warping of space time (black holes have a lot of this)
11. this is the era of the universe that we are currently in, when stars are being formed
13. this is the force that is causing the accelerated expansion of the universe
14. this is the speed an object needs to be moving in order to escape the gravitational pull of an object
17. this is the central part of a black hole
18. a piece of evidence for dark matter is the gravitational lensing of distant galaxies because they bend the light ______ than the visible matter is able to

1. one piece of evidence for dark matter is the outer edges of the Milky Way are orbiting the galactic center _______ than they should be
2. this is the era of the universe where there is nothing left at all, the universe has virtually no energy anywhere
3. often called "the fabric of the universe" these are the 4 dimensions that all objects exist within in the known universe
4. gravitational __________ happens when a very massive distant object magnifies the light from the objects behind it
6. this is the era of the universe where star formation has stopped but the remnants of stars (white dwarfs, neutron stars, etc) are still around
10. gravitational lensing often makes the shape of a cross or a _____
12. about _____________ percent of the universe is believed to be dark matter
15. the is the era of the universe that is named after the only object that is left at that point
16. this is the era of the universe immediately after the Big Bang