We now know that supermassive black holes are common in the cores of galaxies. for some galaxies, a suspiciously high luminosity in a suspiciously small volume provides the needed smoking gun, but the actual luminosity depends heavily on whether stars and gas are available for the black hole to shear them apart. other galaxies may have one too, in spite of an unremarkable central luminosity. these black holes may have already eaten all the surrounding stars and gas, leaving no evidence behind. but stars near the center, in close orbit to the black hole (not too close to be consumed), will have sharply increased speeds. these speeds, when combined with the stars’ distance from the center of the galaxy, are a direct measure of the total mass contained within their orbits. armed with these data, we can use the back of an envelope to calculate whether the attracting central mass is, indeed, concentrated enough to be a black hole. —“death by black hole,” neil degrasse tyson identify the two messages tyson conveys within this passage. a) our universe is filled with powerful but fascinating objects. b) stars near the center of a galaxy move at very high speeds. c) despite the complexity of the universe, humans can understand how it works. d) some galaxies have a black hole at their center that eats stars.
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English, 22.06.2019 08:30, lovebunfan
Asap select 4 statements which could be considered a "theme" of a story, play, poem, etc. a sometimes the most profound ideas can come from unfamiliar places. b my best friend jeffrey has many unusual interests. c once a man gives his soul over to evil, he can never go back. d the three sheepdogs lay around the yard all day. e a priest's collar has an unusual effect upon people. f innocence is a powerful force in a world full of corruption. g king lear is a play shakespeare wrote later. h evil often wears the disguise of innocence. the answer is a c f h
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English, 22.06.2019 10:00, juneham
Ineed . identify the item that shows sharp and vivid details rather than vague and general ones (put a or b for your answer.) a. nearly all people at times suffer from depression, which can be triggered by something as small as a c-minus on a quiz. they may become so depressed that they can’t even answer the phone or get out of bed. b. nearly all people feel sad at times and think things are hopeless. depressed by some event or circumstance, they may be unable to perform even the simplest activities they normally do every day.
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We now know that supermassive black holes are common in the cores of galaxies. for some galaxies, a...
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