Stars and Galaxies (MindTap Course List)
10th Edition
ISBN: 9781337399944
Author: Michael A. Seeds
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 1SP
Arrange the following in order of increasing apparent brightness: Sirius; a full moon: Polaris; Venus; the Sun; the faintest star you can see without a telescope
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Distance from
Apparent Brightness (rank;
brightest, 8 = dimmest)
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Earth (light years) | 1 =
Sun
Sirius
8.6
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Arcturus
309
3.
36.7
4
Rigel
Vega
Alpha Centauri
Bernard's Star
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5
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13 What sentence explains why a star can be much farther from Earth than
the Sun, but still be bright?
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A. Distance from Earth and apparent brightness are related.
B. Bright stars that are farther away are larger than the Sun.
C. The higher it appears in the sky, the brighter the star.
D. The apparent brightness scale goes up as stars get dimmer.
del sdT
What is the apparent magnitude of the Sun as seen from Venus at perihelion? What is the apparent magnitude of the sun as seen from Pluto at aphelion?
Chapter 2 Solutions
Stars and Galaxies (MindTap Course List)
Ch. 2 - Prob. 1RQCh. 2 - Prob. 2RQCh. 2 - Prob. 3RQCh. 2 - Prob. 4RQCh. 2 - Prob. 5RQCh. 2 - Prob. 6RQCh. 2 - Prob. 7RQCh. 2 - Prob. 8RQCh. 2 - Prob. 9RQCh. 2 - Prob. 10RQ
Ch. 2 - Prob. 11RQCh. 2 - Prob. 12RQCh. 2 - Prob. 13RQCh. 2 - Prob. 14RQCh. 2 - Prob. 15RQCh. 2 - Prob. 16RQCh. 2 - Prob. 17RQCh. 2 - Prob. 18RQCh. 2 - Prob. 19RQCh. 2 - Prob. 20RQCh. 2 - Prob. 21RQCh. 2 - Prob. 22RQCh. 2 - Prob. 23RQCh. 2 - Prob. 24RQCh. 2 - Prob. 25RQCh. 2 - Prob. 26RQCh. 2 - Prob. 27RQCh. 2 - Prob. 28RQCh. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Prob. 8PCh. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - What is the angular distance from the north...Ch. 2 - Prob. 12PCh. 2 - Prob. 13PCh. 2 - Prob. 14PCh. 2 - Arrange the following in order of increasing...Ch. 2 - Arrange the following in order of increasing...Ch. 2 - Find the Big Dipper in the star trails photograph...Ch. 2 - Look at The Sky Around You, item 1a. In the...Ch. 2 - Prob. 3LLCh. 2 - Prob. 4LL
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- As seen from Earth, the Sun has an apparent magnitude of about 26.7 . What is the apparent magnitude of the Sun as seen from Saturn, about 10 AU away? (Remember that one AU is the distance from Earth to the Sun and that the brightness decreases as the inverse square of the distance.) Would the Sun still be the brightest star in the sky?arrow_forwardIs the Sun an average star? Why or why not?arrow_forwardHow does this radius of Sirius B compare with that of Earth?arrow_forward
- From Doppler shifts of the spectral lines in the light coming from the east and west edges of the Sun, astronomers find that the radial velocities of the two edges differ by about 4 km/s, meaning that the Sun’s rotation rate is 2 km/s. Find the approximate period of rotation of the Sun in days. The circumference of a sphere is given by 2pR, where R is the radius of the sphere.arrow_forwardDescribe the spectrum of each of the following: A. starlight reflected by dust, B. a star behind invisible interstellar gas, and C. an emission nebula.arrow_forwardConfirm that the angular diameter of the Sun of 1/2° corresponds to a linear diameter of 1.39 million km. Use the average distance of the Sun and Earth to derive the answer. (Hint: This can be solved using a trigonometric function.)arrow_forward
- The star Sirius A has an apparent magnitude of 1.5 . Sirius A has a dim companion, Sirius B, which is 10,000 times less bright than Sirius A. What is the apparent magnitude of Sirius B? Can Sirius B be seen with the naked eye?arrow_forwardWhat does the word apparent mean in apparent visual magnitude?arrow_forwardOne method to measure the diameter of a star is to use an object like the Moon or a planet to block out its light and to measure the time it takes to cover up the object. Why is this method used more often with the Moon rather than the planets, even though there are more planets?arrow_forward
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