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Horizons - Exploring the Universe 12th edition. Learn More eBook Your students can pay an additional fee for access to an online version of the textbook that might contain additional interactive features. Lifetime of Edition LOE Your students are allowed unlimited access to WebAssign courses that use this edition of the textbook at no additional cost. Terms of Use. Terms of Use Access is contingent on use of this textbook in the instructor's classroom. Student Pricing. Table of Contents.
Partners Our Partners. Follow Us. Subscribe to our Newsletter Get the latest tips, news, and developments. Subscribe Now! Chapter 9 : The Formation and Structure of Stars. An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
This box will be sent out to every program subscriber every month. The collision caused the breakup of a major asteroid, creating a shower of dust throughout the inner Solar System. Each month, get a sample fountain pen and ink bottle. Sometimes it's just easier to have someone do the work for you! At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines a. An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. Javascript is not enabled in your browser.
An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. Refer to Table Which star in the table would appear the brightest to an observer on Earth? Nim d. Based on the information in the table, what is the ratio of the intensity of Dra to that of Nim?
Which star in the table would not be visible to the unaided eye of an observer on Earth? Star A has an apparent visual magnitude of Polaris is a second magnitude star, and Phi Pegasi is about 16 times fainter than Polaris. What is the approximate magnitude of Phi Pegasi? Do the constellations visible in the sky at a particular time of night say 9 P. No, the same constellations are visible at 9 P. As the year progresses, the constellations visible at 9 P.
Yes, at 9 P. However, there are some constellations that are visible all year long. Which of the following statements correctly describes the relationship between stars and constellations? Only stars close to the ecliptic the Earth's orbital plane are located in constellations. Every star is located in a constellation. Only the brighter stars are in constellations. Only those stars that were visible to the ancient Greeks are located in constellations.
How much of the night sky is north of the celestial equator? If you point toward the zenith right now and then point there again 6 hours later, you will have pointed twice in the same direction relative to a. If an observer walks north toward increasing latitude, the number of circumpolar stars would a.
Unknown unless you also state the longitude of the observer. If you were standing on the Earth's equator, which of the following in the sky would pass through your zenith during the entire day 24 hours? If you are standing at the Earth's north pole, which of the following would be located at the zenith? Stars in the same constellation a. During the month of June the north celestial pole points towards Polaris, but during the month of December it points a. English b. Arabic c. Greek d. Ursa Majoris is the name of the brightest star.
Seen from the northern latitudes, the star Polaris a. A sketch of the Earth with its north and south poles and equator is shown. The zenith is located in the sky over your head if you are at a. Earth's equator.
Mike is coauthor with Dana Backman of Horizons: Exploring the Universe, 12th edition (); Universe: Solar Systems, Stars, and Galaxies, 7th edition (); . Editorial Reviews. About the Author. Mike Seeds was a professor of physics and astronomy at Horizons: Exploring the Universe 12th Edition, Kindle Edition. by .
Earth's north pole. Earth's south pole. During one day and night in the mid-northern hemisphere, the stars near the north celestial pole As seen from the Earth's southern hemisphere, the celestial equator passes a. At the Earth's north pole, the north celestial pole is directly overhead and stars near the horizon travel in straight lines a. Star A has an apparent visual magnitude of 6. ANS: 2. All the constellations in the sky were created by the Greeks. A second magnitude star in Ursa Major is brighter than a fourth magnitude star in Orion.
The Greek letter designation conveys information about a star's location and brightness. The celestial equator always passes directly overhead.
The celestial equator always crosses the horizon at the east point and west point. Navigators can find their latitude in the northern hemisphere by measuring the angle from the northern horizon to the north celestial pole. A scientific model is a mental conception that provides a framework that helps us think about some aspect of nature.
The constellation of Orion is currently visible in the evenings in January. Precession will not affect this and Orion will still be visible in January 13, years from now. A 3rd magnitude star is 3 times brighter than a 1st magnitude star. As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole. Hipparchus devised the magnitude system in the late 's. Polaris has always been the star nearest the north celestial pole. ESSAY 1. ANS: Answer not provided.
PTS: 1 2. Describe the location of Polaris in the sky relative to the horizon as seen by observers in Alaska lat. PTS: 1 3. What information does a star's Greek-letter designation convey? PTS: 1 4. What advantage is there in referring to a star by its Greek-letter designation and constellation name rather using its traditional name?