By Bradford Smith, George Blumenthal, Laura Kay

Teaches scholars to imagine like scientists.

Authors Laura Kay and Stacy Palen have constructed pedagogy that is helping scholars comprehend the method of technology, and the way actual rules are used to find the origins of the universe. The authors emphasize how we all know what we all know within the figures, textual content, and end-of-chapter material.

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Extra info for 21st Century Astronomy (4th Edition)

Example text

1"#"LJ,LJ interactive, use art from the text to help students visualize important physical and astronomical concepts. )LJ manipulate variables and see how physical systems work. &ŻLJ-#,Ų ,(ŻLJ(LJ
))&LJ formats. ,)Tours and applets. Coursepacks are available in BlackBoard, Angel, Desire2Learn, and Moodle formats. Instructor’s Resource Folder This two-disc set contains the Instructor’s Resource DVD—which contains the same files as the Instructor’s Resource website—and the Test Bank on CD-ROM in ExamView format.

1. Yet even this address is not complete, because the vast structure we just described is only the local universe. 5 cosmic address? trillion kilometers (km) or 6 trillion miles. 7 billion light-years—and within this volume we estimate that there are hundreds of billions of galaxies, roughly as many galaxies as there are stars in the Milky Way. In addition, scientists have concluded that our universe contains much more than the observed planets, stars, and galaxies. Up to 95 percent of the universe is made up of matter that does not emit light (called dark matter) and a form of energy that permeates all of space (dark energy)—neither of which is well understood.

A scientific principle is a general idea or sense about how the universe is that guides the construction of new theories. Occam’s razor, for example, is a guiding principle in science stating that when we are faced with two hypotheses that explain a particular phenomenon equally well, we should adopt the simpler of the two, unless the more complicated answer better matches the results of observations or experiment. Another principle comes from the late astronomer Carl Sagan (1934–1996) and is often phrased as “Extraordinary Claims Require Extraordinary Evidence,” meaning that when making a new and truly extraordinary claim that has not been tested, confirmed, or proven, extraordinary evidence is required.

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