Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 1, Problem 35Q
To determine
The benefits of using light year as the unit of distance by astronomers.
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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.
What is the difference in magnitude for two stars is one appears four times brighter than the other?
Earth is about 150 million kilometers from the Sun, and the apparent brightness of the Sun in our sky is about 1300 watts/m2. Determine the apparent brightness that we would measure for the Sun if we were located 12 times Earth's distance from the Sun.
Chapter 1 Solutions
Universe
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- Explain the origin of the magnitude designation for determining the brightness of stars. Why does it seem to go backward, with smaller numbers indicating brighter stars?arrow_forwardplease help me figure out the missing boxes with the given informationarrow_forwardThe distance between the Earth and the Sun is ca. 150,000,000 km. If the Sun suddenly stopped shining, how long will it take before we find out?arrow_forward
- Calculate the number of miles in a light-year, using 1.86 105 mi/s as the speed of light. (Hint: The number of seconds in a year, 365 days, will be useful.) Incorrect: Your answer is incorrect. mi/yarrow_forwardFind the distance in parsecs to Proxima Centauri, which has an annual parallax of 0.772 arcsec.arrow_forwardIn astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. The distance to Alpha Centauri, the closest star other than our own sun that can be seen by the naked eye, is 4.3 light-years. Express this distance in meters.arrow_forward
- How many times dimmer is a star with magnitude +3 compared with the planet Mars with a magnitude of -1?arrow_forwardA parsec is an astronomical unit of distance where 1 parsec = 3.26 light years (1 light year equals the distance traveled by light in one year). If the speed of light is 186,000 mi/s, calculate the distance in meters of an object that travels 7.5 parsecs. marrow_forwardAn astronomer makes precise measurements of a star with respect to the background celestrial sphere. She finds the star changes its position from January 1 to July 1 by a total of 1.9 arcseconds. How far away is this star in light years? (round your answer to the nearest 0.1 light years)arrow_forward
- In astronomy, distances are often expressed in light-years. One light-year is the distance traveled by light in one year. If the distance to a star is 3.5 light-years, what is this distance in meters? (There are 365.25 days in one year.)arrow_forwardWhen we look at a particular star, we are seeing it as it was 371 years ago. How far away from us (in meters) is the star? Take a year to be 365.25 days.arrow_forwardDo stars that look brighter in the sky have larger or smaller magnitudes than fainter stars?arrow_forward
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