By Michael A. Seeds, Dana Backman
With their best-selling astronomy textbook, HORIZONS, authors Mike Seeds and Dana Backman assist you comprehend your home within the universe--not simply your situation in house yet your function within the unfolding heritage of the actual universe. to accomplish this target, they makes a speciality of primary questions: "What Are We?" which highlights your house as a planet dweller in an evolving universe, guiding you to higher comprehend the place we got here from and the way we shaped; and "How can we Know?" which supplies insights into how the method of technology can educate us extra approximately what we're.
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Additional resources for Horizons: Exploring the Universe (12th Edition)
Example text
3. 50 ϫ 108 km. Explain why this is the same as 150 ϫ 106 km. 4. 72 AU from the sun. What is that distance in kilometers? 5. Light from the sun takes 8 minutes to reach Earth. How long does it take to reach Mars? 6. The sun is almost 400 times farther from Earth than is the moon. How long does light from the moon take to reach Earth? 7. If the speed of light is 3 ϫ 105 km/s, how many kilometers are in a light-year? How many meters? ) 8. How long does it take light to cross the diameter of our Milky Way Galaxy?
Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it. NOAO 4. In the photograph shown here, which stars are brightest, and which are faintest? How can you tell? Why can’t you tell which stars in this photograph are biggest or which have planets? Learning to Look Guidepost The previous chapter took your on a cosmic zoom through space and time. That quick preview only sets the stage for the drama to come. Now it is time to look closely at the sky, and answer three essential questions: ▶ How do astronomers refer to stars?
S Latitude 60° N E Zenith What you see in the sky depends on your latitude as shown at right. Imagine that you begin a journey in the ice and snow at Earth’s North Pole with the north celestial pole directly overhead. As you walk southward, the celestial pole moves toward the horizon, and you can see further into the southern sky. The angular distance from the horizon to the north celestial pole always equals your latitude (L)—the basis for celestial navigation. As you cross Earth’s equator, the celestial equator would pass through your zenith, and the north celestial pole would sink below your northern horizon.