See the Aurora Australis From Outer Space
Aurora australis is also known as the southern lights.
NASA
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Contunico © ZDF Studios GmbH, Mainz; Thumbnail © Rinus Baak/Dreamstime.comLearn about the monarch butterfly, including its annual migration to Mexico.
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Encyclopædia Britannica, Inc.Explanation of the periodic table.
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Encyclopædia Britannica, Inc.About 4.6 billion years ago, a nebula collapsed. The rest is history.Media Editor: Lauren Sims
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Encyclopædia Britannica, Inc.Isaac Newton's formulation of the law of universal gravitation.
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Science in Seconds (www.scienceinseconds.com) (A Britannica Publishing Partner)Video of Earth as seen from the International Space Station.
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Contunico © ZDF Studios GmbH, Mainz; thumbnail © Volodymyr Shevchuk/Dreamstime.comOverview of water tides.
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© MinutePhysics (A Britannica Publishing Partner)Learn about the different definitions of a year: a tropical year, a sidereal year, and an anomalistic year.
