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Astronomy 100 HW #11

Astronomy 100 HW #11 - Astronomy 100 HW#11 1 a A rotation...

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Astronomy 100 HW #11 1) a. A rotation curve helps show the orbital velocity by plotting the rotational velocity of stars or gas clouds compared to their distance from the galaxy’s center. b. The rotation curve for the solar system has an x-asymptote of zero and a y- asymptote of about three. The curve is close to symmetrical diagonally, with the point of symmetry being between the points for Jupiter and Saturn. The highest x value is about 40 for Pluto and the highest y value is about 48 for Mercury. The rotation curve for the Milky Way has an x-asymptote of zero, then the main portion of the diagram is a group extending to the right from about 2 thousand light-years from the center of the galaxy by 250 km/s, to about 100 thousand light-years from the center of the galaxy by 250 km/s. The sun is about a third of the way down this main line. c. The solar system curve shows that about half the universe moves fast and is closer to the sun, while the other half moves much slower and is further away from the center of the galaxy. This is because that center is the sun which contains most all of the solar system’s mass. The Milky Way curve is mostly flat, with the sun on this line, meaning that points both inside and outside of the sun in relation to the galaxy’s center have just as much or more mass as the sun. d. It questions the existence of large amounts of dark matter, since it shows most of the mass is located in the spherical halo, but there isn’t that much radiation coming from the halo as stars and gas clouds would be producing, begging the idea of large amounts of dark matter.
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