EBK STARS AND GALAXIES
EBK STARS AND GALAXIES
10th Edition
ISBN: 8220106798485
Author: Seeds
Publisher: Cengage Learning US
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Chapter 1, Problem 11P

How long does it take light to cross the diameter of the Milky Way Galaxy?

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What is the total mass of the Milky Way Galaxy?
The brightest star in the northern hemisphere is Sirius. Its distance from earth is estimated to be 8.7 light years. A light year is the distance light travels in one year. Light travels at a speed of 3.00 x 108 m/s. Calculate the distance from earth to Sirius in miles. (1 mi = 5280 ft)
The nearest star to our sun is Proxima Centauri, at a distance of 4.3 light-years from the Sun. A light-year is the distance that light travels in one year (365 days). How far away, in kilometers, is Proxima Centauri from the Sun?Express your answer using two significant figures.
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