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Black Holes

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Submitted By azoguina
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According to the article Black holes first, galaxies second it has been found out that each galaxy has a black hole in the center (16). By observing motions of gas it had been suggested that early galaxies were 30 times as huge as central black holes. Therefore, it has been suggested that galaxies are formed around black holes (16). Doppler shifts show the black hole mass. Astronomers believe that both the hole and the galaxies can stop growing (16).
As stated in Spinning Hearts of Darkness “Astronomers are measuring the rotation rates of black holes to determine their rotation and history” (Brenneman, 20). A black holes’ gravity is so strong that light can’t pass through it (20). As stated in the article Black holes are neither let in light or let it come out (Brenneman, 21). Black holes can be up to billions solar masses. Measuring a black holes spin is important because it can tell us about its history (22). Black holes that occur because of mergers with other black holes will grow slower than those that occur by accretion. As stated in Brenneman “Black holes occur at random angles which alter the spin direction and speed of resulting black hole”(22). Einstein’s general theory of relativity the black hole spins in the same direction as its rotation disk. The disks’s

"Black Holes First, Galaxies Second." Sky & Telescope 117.5 (2009): 16. MasterFILE Elite. EBSCO. Web. 13 Oct. 2011.
BRENNEMAN, LAURA. "Spinning Hearts of Darkness. (cover story)." Sky & Telescope 121.5 (2011): 20-25. MasterFILE Elite. EBSCO. Web. 13 Oct. 2011.

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