Geography

Geography, 25.10.2019 10:43, Blansery6819

Observations indicate that galaxies with more massive central black holes tend to also have

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Physics, 13.07.2019 03:00, Kode74651

Supermassive black holes are believed to be located at the center of many galaxies because a. the rotation curve of the galaxy indicates that 90% of the galaxy is dark matter. b. the orbital speeds of a globular clusters in the galaxy are greater than the speed of light. c. the orbital motion of material near the center is very fast and indicates a very massive core. d. the shape of the bulge in all spiral galaxies can only be supported by a supermassive black hole. e. the spiral structure requires a black hole to maintain the spiral arms.

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English, 20.07.2019 07:00, marvin07

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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Physics, 19.08.2019 22:20, jerali

Which statement(s) about galaxy groups is/are true? choose one or more: a. galaxy mergers in groups are not known to have ever happened b. galaxies in a group are all moving away from each other. c. interactions between massive and less-massive galaxies affect only the smaller galaxies. d. tidal streams can result from galaxy interactions. e. the largest galaxies tend to have satellite galaxies.

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Geography, 22.08.2019 04:30, vxdsvsfdds

Which statement(s) about galaxy groups is/are true? choose one or more: a) galaxy mergers in groups are not known to have ever happened b) galaxies in a group are all moving away from each other.c) interactions between massive and less-massive galaxies affect only the smaller galaxies. d) tidal streams can result from galaxy interactions. e) the largest galaxies tend to have satellite galaxies.

Answers: 2

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