Black Holes Spelling Quiz

A black hole is a region of spacetime where gravity is so strong that nothing — no 1. a) particles b) particals c) particules or even electromagnetic radiation such as light — can escape from it. The theory of general relativity predicts that a 2. a) sufficiently b) sufficiantly c) sufficientally compact mass can deform spacetime to form a black hole. The boundary of no escape is called the event horizon. Although it has an enormous 3. a) affect b) effect c) effact on the fate and circumstances of an object crossing it, according to general relativity it has no locally 4. a) detectible b) detectable c) detecteble features. In many ways, a black hole acts like an ideal black body, as it reflects no light. Moreover, 5. a) quantem b) quantim c) quantum field theory in curved spacetime predicts that event horizons emit Hawking radiation, with the same spectrum as a black body of a temperature 6. a) inversly b) inversely c) inversally proportional to its mass.

Black holes of stellar mass form when very massive stars collapse at the end of their life cycle. After a black hole has formed, it can continue to grow by absorbing mass from its surroundings. By absorbing other stars and merging with other black holes, supermassive black holes of millions of solar masses may form. There is a general 7. a) consensous b) consences c) consensus that supermassive black holes exist in the centres of most galaxies.

The 8. a) presence b) presense c) precense of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as 9. a) visable b) vizable c) visible light. Matter that falls onto a black hole can form an external accretion disk heated by friction, forming 10. a) quasars b) quazers c) quazars, some of the brightest objects in the universe.