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Download Universe: Solar System, Stars, and Galaxies by Michael A. Seeds, Dana Backman PDF

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By Michael A. Seeds, Dana Backman

With their best-selling astronomy textbook, UNIVERSE: sunlight process, STARS, AND GALAXIES, authors Mike Seeds and Dana Backman assist you comprehend your house within the universe--not simply your position in area yet your position within the unfolding historical past of the actual universe. to accomplish this objective, the authors specialize in imperative questions: "What Are We?" which highlights your home as a planet dweller in an evolving universe, guiding you to raised 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 technological know-how can train us extra approximately what we're.

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Extra resources for Universe: Solar System, Stars, and Galaxies

Sample text

25 days, and consequently the sun appears to circle the sky in the same period. 25 days, travels about 1° eastward in 24 hours, about twice its angular diameter. You don’t notice this apparent motion of the sun because you can’t see the stars in the daytime, but it does have an important consequence that you do notice—the seasons. 4° from the perpendicular to its orbit, it has seasons. 4°, the sun moves into the northern sky in the spring and into the southern sky in the fall. That causes the cycle of the seasons.

West ial est Cel The eastward rotation of Earth causes the sun, moon, and stars to move westward in the sky as if the celestial sphere were rotating westward around Earth. From any location on Earth you see only half of the celestial sphere, the half above the horizon. The zenith marks the top of the sky above your head, and the nadir marks the bottom of the sky directly under your feet. The drawing at right shows the view for an observer in North America. An observer in South America would have a dramatically different horizon, zenith, and nadir.

In an idealized model, some complex aspects of nature can be simplified or omitted. The ball-and-stick model of a molecule doesn’t show the relative strength of the chemical bonds, for instance. A model gives scientists a way to think about some aspect of nature but need not be true in every detail. When you use a scientific model, it is important to remember the limitations of that model. If you begin to think of a model as true, it can be misleading instead of helpful. The celestial sphere, for instance, can help you think about the sky, but you must remember that it is only a model.

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