Read this excerpt from "Why Are They Called Black Holes?" After many millions or billions of years, the star runs out of hydrogen and energy. Then the star "dies" and collapses into a dense little ball with tons of gravity. Albert Einstein’s theory of relativity predicted that black holes would have to exist if a dead star had enough gravity. Using Einstein's theory, astronomers calculated that if a star more than three times as heavy as our sun died, the force of gravity pulling matter in could overwhelm any other force pushing matter out. In this excerpt, the author makes a connection between a scientific theory and the calculations that scientists make. the beginning of a star's existence. the idea that all things live and die. the question of why gravity exists.
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English, 21.06.2019 14:50, angelreji386
Read the excerpt from an argumentative essay on space exploration. we probably couldn’t go to all the stars because they’re too far away. it would take a long time to get there. the sentences need to be revised for this type of essay because they
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English, 21.06.2019 18:30, sethlynn2003
Her brother joined the army before he finished college. identify the adverb clause in the sentence. a) finished college b) her brother joined c) brother joined the army d) before he finished college
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English, 22.06.2019 02:30, romaguera06
Create a purpose statement based on the graphic organizer in "section ii: finding the main point."
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English, 22.06.2019 04:30, ant5784tgi
How does moon shadow beliefs about dragons him to understand what is happening
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Read this excerpt from "Why Are They Called Black Holes?" After many millions or billions of years,...
Mathematics, 15.12.2020 05:00
Mathematics, 15.12.2020 05:00