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Astronomy Name ___________________________________ Black Hole – Reading Quiz Use your ppt notes, the pre-reading, and the reading, “Black Holes, From Here to Infinity” DO YOUR OWN WORK! True or False _____1. A black hole is like a cosmic vacuum cleaner, sucking up everything around it. _____2. In a black hole, gravity is so strong that the escape velocity exceeds light speed. _____3. NASA has sent a probe into a black hole. _____4. Our Sun will eventually turn into a black hole. _____5. A massive black hole may lie at the center of the Milky Way galaxy. _____6. Astronomers find black holes by looking for fast moving stars orbiting empty space. _____7. The escape velocity for the Sun is greater than that of the Earth because it is hotter. _____8. Quasars are very distant galaxies with actively “feeding” supermassive black holes. Multiple Choice ____9. All of the following are characteristics of quasars EXCEPT they are _______. a. radio sources b. very bright c. visible to naked eye d. very far ___10. Who first did the thought experiment about stars becoming black holes? a. Newton b. Kepler c. Hawking d. Michel ___11. Where are supermassive black holes found? a. galaxy cores b. spiral arms c. between galaxies ___12. What force causes material to be pulled into a black hole? a. magnetism b. gravity c. density d. halo of galaxy d. electricity ___13. What part of the electromagnetic spectrum shows us high temperatures and energy? a. visible b. ultraviolet c. x rays d. radio ____14. Escape velocity on Earth is about _______ miles/second. a. 25,000 b. 1000 c. 380 d. 7 ____15. A supermassive black hole can be ___________(of) times the mass of our Sun. a. thousands b. less than a million c. billions ____16. Once you cross the ____________ of a black hole, there is no escape. a. event horizon b. disk c. core d. singularity ____17. At the __________ of a black hole, space and time come to an end. a. event horizon b. disk c. core d. singularity ____18. Are black holes really black? a. Yes, but material falling into them get hot enough to glow. b. No, the black hole is invisible. c. Both a and b ____19. Are black holes dangerous to us? a. No, they are too far away for us to worry about. b. Yes, we will eventually fall into a black hole. c. Both a and b ____20. What if our Sun turned into a black hole? a. We wouldn’t notice (except we wouldn’t have any sunlight!). b. We would begin to fall into it. c. We would immediately fall into it. ____21. Can black holes help us travel through time? a. That’s science fiction, it won’t work in reality. b. Yes, black holes can twist space and time and will form wormholes. ____22. Where is the nearest black hole? a. At the center of the Milky Way, about 30,000 light years away. b. In our solar system, past Pluto c. About 1600 light years away ____23. A Wormhole is _________________. a. Something made by a worm in an apple. b. Shortcut through space made by a black hole c. A mathematical possibility. d. Both b and c e. None of these ____24. When black holes are “born,” a(n) __________ may be observed. a. New “star” b. Gamma ray burst c. Supernova d. All of the above 25. What is EXIST and what will it do?