Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 1, Problem 3RQ
Why are light-years more convenient than miles, kilometres, or astronomical units for measuring certain distances?
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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 5.9 light-years, what is this distance in meters? (There are 365.25 days in one year.)
In 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.
Chapter 1 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 1 - What is the largest dimension of which you have...Ch. 1 - What is the difference between our Solar System,...Ch. 1 - Why are light-years more convenient than miles,...Ch. 1 - Why is it difficult to detect planets orbiting...Ch. 1 - Prob. 5RQCh. 1 - What is the difference between the Milky Way and...Ch. 1 - What are the largest known structures in the...Ch. 1 - Prob. 8RQCh. 1 - How Do We Know? How does the scientific method...Ch. 1 - You and three of your friends have won an...
Ch. 1 - Think back to the last time you got a new phone...Ch. 1 - The diameter of Earth across the equator is 7928...Ch. 1 - The diameter of the Moon across its equator is...Ch. 1 - One astronomical unit is about 1.50108 km. Explain...Ch. 1 - Venus orbits 0.72 AU from the Sun. What is that...Ch. 1 - Light from the Sun takes 8 minutes to reach Earth....Ch. 1 - The Sun is almost 400 times farther from Earth...Ch. 1 - If the speed of light is 3.00105 km/s. how many...Ch. 1 - How long does it take light to cross the diameter...Ch. 1 - The nearest large galaxy to our n is about 2.5...Ch. 1 - How many galaxies like our own would it take Laid...Ch. 1 - In Figure 1-4, the division between daylight and...Ch. 1 - Prob. 2LTLCh. 1 - Prob. 3LTLCh. 1 - Prob. 4LTL
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- Light year is the unit of ___________arrow_forwardThe brightness, or intensity, of starlight varies inversely as the square of its distance from earth. The Hubble telescope can see stars whose intensities are 1/64 that of the faintest stars now seen by ground based telescope. Determine how much farther the Hubble telescope can see into space than ground based telescope. How much farther can the Hubble telescope see into space than ground based telescope?arrow_forwardlight travels at a rate of 1.86x10^5 miles per second. how far does light travel in one minute (6.0x10^1 seconds)?arrow_forward
- Light from the sun reaches us in nearly A) 5 min B) 4.30 hrs C) 8 min D) 5.30 hrsarrow_forwardThe time it takes for light to travel from the closest star{other than the sun}to the earth is closest star.arrow_forwardHow far does light travel in 1 year? [This distance, known as a light-year (ly), is used in measuring astronomical distances (Ch. 18.1).]arrow_forward
- If the speed of light is 3.0 × 105 km/s, how many kilometers are in a light-year? How many meters? (Hint: First look up or calculate how many seconds are in a year.)arrow_forwardWhy did early human cultures observe astronomical phenomena? Was it for scientific research?arrow_forwardThe 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)arrow_forward
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