Stars Quiz B >> Astronomy: Exploring Time and Space
TOTAL POINTS 8
1.Every star starts by “burning” the most abundant nuclear fuel, hydrogen, and turning it into helium. Stars that are still fusing hydrogen in their cores into helium can be found in which part of the HR (Hertzsprung-Russel) Diagram?
1 point
2.Star A and Star B are both main sequence stars. Star A has twice the mass of Star B. Star A has __________ fuel in its core for nuclear fusion.
1 point
3.The next phase in the life of a sun-like main sequence star immediately after it leaves the main sequence and begins fusing elements heavier than Hydrogen in its core is called…
1 point
4.At the end of its life, the Sun will eventually become a…
1 point
5.Pulsars are the rapidly rotating cores of a dead star that has become a…
1 point
6.Einstein’s theory of general relativity can be used to describe the effects of gravity near a massive object like a black hole. As viewed by a distant observer, the clock on board a spacecraft approaching the event horizon of a black hole would seem to…
1 point
7.True or False: Stars that are more than three times the mass of the Sun end their lives as a black hole. Black holes bend spacetime so much that the only thing that can travel fast enough to escape from inside the event horizon is light.
1 point
8.True or False: Although black holes are, in theory, completely invisible to our telescopes, they may be observed by the large amounts of energy given off as matter accelerates on its way into the black hole.
1 point
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