Foundations of Astronomy (MindTap Course List)
Foundations of Astronomy (MindTap Course List)
14th Edition
ISBN: 9781337399920
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 15, Problem 4P
To determine

The time required by the halo star to pass the disk of Milky Way Galaxy.

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If the active core of a galaxy contains a black hole of 106?Θ (1 million solar masses), what will the orbital velocity be for matter orbiting the black hole at a distance of 0.33 AU? (Hint: use the formula for orbital velocity: ?=√???; where ?=6.67×10−11 ?3?? ?2 and ?Θ= 2.0×1030 ??. Note: 1 ??=1.50×1011 ?)
Suppose you measure the radial velocity of a galaxy to be 5,000 km/s. How far away is it?
If a galaxy has a radial velocity of 21,641 km/s, what is its expected distance from the Hubble Law?  Assume that the Hubble Constant is 71 km/s/Mpc.  Answer in Mpc
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