Perspectives on Astronomy, Media Edition (with CengageNOW, Virtual Astronomy Labs Printed Access Card) (Available 2010 Titles Enhanced Web Assign)
Michael A. Seeds
Format: PDF / Kindle (mobi) / ePub
Authors Mike Seeds and Dana Backman personalize the history of the universe by placing you at the center of the latest chapter in a grand and amazing story. You will learn how we are the latest link in the "great chain of origins." And, by emphasizing the role of the scientific process, Seeds and Backman will help you also understand how analyzing scientific evidence not only answers the question "How do we know?," but provide deeper insights into our place in the universe as well. Each new copy of the text comes with access to CengageNOW, an online personalized learning system designed to save you time in studying and to help you prepare for exams through a series of diagnostic tests and personalized study plans.
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System, examine Hercules X-1 (■ Figure 8-15). It emits pulses of X rays with a period of about 1.2 seconds, but every 1.7 days the pulses vanish for a few hours. Hercules X-1 seems to contain a 2-solar-mass star and a neutron star that orbit each other with a period of 1.7 days. Matter flowing from the normal star into an accretion disk around the neutron star reaches temperatures of millions of degrees and emits a powerful X-ray glow, some of which is in beams that sweep around with the rotating.
And the details of the dust clouds in the disk of the galaxy do not show well. The two negative images of the galaxy have been processed to show the dust clouds more clearly. (C. Howk, B. Savage, N. A. Sharp NOAO/WIYN/NSF) 68 PART 1 | Visual-wavelength negative images EXPLORING THE SKY ■ Seat prices in a baseball stadium Red most expensive Violet least expensive a Radio intensity map Red strongest Violet weakest ■ Figure 4-14 (a) A contour map of a baseball stadium shows regions of.
5-6 ❙ Solar Activity Why does the sun have a cycle of activity, and how does that affect Earth? ■ ■ neutron (p. 79) electron (p. 79) heat (p. 79) temperature (p. 79) emission line (p. 86) Kirchhoff’s laws (p. 86) transition (p. 87) Lyman series (p. 87) Balmer series (p. 87) Kelvin temperature scale (p. 79) Paschen series (p. 87) absolute zero (p. 79) chromosphere (p. 88) Sunspots seem dark because they are slightly cooler than the rest of the photosphere. The average sunspot is about.
Another factor of 100, and the sun and its neighboring stars van- ish into the background of thousands of stars. This figure is 1700 ly in diameter. Of course, no one has ever journeyed thousands of light-years from Earth to look back and photograph the sun’s neighborhood, so this is a representative picture from Earth of a part of the sky that can be used as a ■ Figure 1-10 universe—an island universe of stars in an otherwise empty vastness. Now the Milky Way Galaxy is known to be not.
Or as rising currents of hot gas and sinking currents of cool gas in a convective zone. ■ Stars of the sun’s mass or less make energy via the proton–proton chain; more massive main-sequence stars fuse hydrogen into helium in the CNO cycle. ■ Observations of too few neutrinos coming from the sun’s core are now explained by the changing of neutrinos back and forth among three different types called “flavors.” The neutrinos confirm that the sun makes its energy by hydrogen fusion. nuclear.