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9) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: The Reason for the Seasons
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Description
Contrary to popular belief, the seasons are not caused by changes in the distance between Earth and the Sun over the course of a year. Instead, the tilt of Earth's axis of spin relative to the axis of its orbital plane produces seasons.
12) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: The Inflationary Universe
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The remarkable large-scale uniformity and "flatness" of the Universe pose a problem for the standard Big Bang theory. A startling but powerful suggested explanation is that the Universe went through an initial period of exponential expansion, called inflation.
13) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: A Grand Tour of the Cosmos
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Description
You embark on a fantastic voyage throughout the Universe, starting in this lecture with a whirlwind tour of the course, which extends from phenomena in Earth's atmosphere to events at the farthest reaches of space and time.
14) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Einstein's Biggest Blunder?
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The unexpected finding that the Universe is expanding at an ever-faster rate lends support for the existence of a non-zero cosmological constant, a formerly discredited idea of Einstein's, which he once called his "biggest blunder."
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Apparent brightness is the observed brightness of a star. Because stars are at different distances, astronomers need a standard reference by which to compare stars in absolute terms, as if they're all at the same distance. This standard is called intrinsic brightness, or luminosity.
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