A variable star is one whose apparent brightness changes as viewed from earth. Cepheid variables are a certain type of variable star whose apparent brightness changes in regular cycles lasting from 3 to 50 days. Astronomers use them to measure distances in space.
Q: 4 describe and explain the characteristic of Hertzsprung-Russell diagram.
what is the significant and use of this diagram? how is a black hole formed? what are the properties of black holes? compute the Schwarzschild radius for the sun.
What happens when the star shrinks to the radii? what is the most likely place to find a black hole?
The Hertzsprung-Russell diagram is a scatter-graph of stars that allows astronomers to plot their absolute luminosity against their specific classifications and temperatures. This technique demonstrated that the temperature and luminosity of stars are not random but related in such a way as to permit classification.
Stars much larger than that explode much more violently and completely than those that end up as dwarf stars. They produce black holes whose only features are vestigial remains of the original star such as mass and electromagnetic signature. They are regions of infinite gravity from where even light cannot escape.
The Schwarzschild radius is the size that a given object would have to be for its matter to be...
The words of 'I regret to have killed' in the Battle of Dragon and Tiger were too poor. I'll thrash you with a steel mace was still the best. But when he wanted to raise his hands, he remembered that they were bound together; so he did not sing I'll thrash you either."(113) Lu Hsun's narrator in the story is another highlight of the work. The narrator is as fictional
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