Homework 1 and 2

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School

Middle Tennessee State University *

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1010

Subject

Astronomy

Date

Apr 3, 2024

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docx

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2

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Chapter 1 Homework Questions (evens) 2) The equatorial diameter of the moon is 3476 kilometers. If a kilometer equals 0.6214 miles, what is the moon’s diameter in miles? About 2160 miles 4) A typical galaxy is shown on the first page of the universal bowl on the inside cover of the printed book. Express the number of stars in this typical galaxy in scientific notation. 10^11, there are roughly 100 billion stars. 6) Venus orbits 0.72 AU from the sun. What is the distance in kilometers? 108 million kilometers 8) The sun is almost 400 times farther from earth is the moon. How long does light from the moon take to reach earth? About 1.28 seconds to reach earth 10) Light from the tar Betelgeuse takes 640 years to reach earth. How far away is Betelgeuse in unites if light years? Name any historical event that occurred on earth at about the time the light left Betelgeuse. Is the distance to Betelgeuse unusual compared with other stars? 640 light years since a light year measures how far light travels in a year. Assuming the light would reach us in the year 2024, the last time light would have left Betelgeuse would have been in 1384 when the siege of Lisbon by the Castilian army, during the 1383 – 1385 crisis in Portugal. It is unusual because it is a variable star, meaning that its brightness as seen from earth changes with time. 12) The nearest galaxy to our home galaxy is about 2.5 million years away. How many meters is that? 2.3651826e+22 meters.
Chapter 2 Homework Questions (odds) 1) Star A has a magnitude of 9.5; star B 5.5; and star C 2.5. Which is brightest? Which are visible to the unaided eye? Which pair of stars has a flux ration about 16? Star C is the brightest. Star B is visible, but star A is not. The two stars that have the flux ration of 16 is Star A and Star B. 3) If light from one star is 251 times brighter (has 251 times more flux) than light from another star, what is their difference in magnitudes? The difference is 6.0 magnitudes. 5) If earth receives one-third as much light per unit area per unit time from star A compared to star B, what is the apparent visual magnitude difference between the stars? Which star is apparently brighter, Star A or Star B? Star B is brighter than Star A 7) If two stars differ by 8.0 magnitudes, what is their flux ratio? The flux ratio is 400. 9) If star A is magnitude 1.0 and Star B is magnitude 9.6, which is brighter and by what factor? 2.512^(1.0-9.6) = 2512. This means that star A is brighter than Star B by a factor of 2700 11) What is the angular distance from the north celestial pole to the point on the sky called the vernal equinox? To the summer solstice? The point in the sky from the vernal equinox is 90 degrees, and the summer solstice is 66.5 degrees.
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