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Lecture 16

Lecture 16 - Terrestrial Planets-Mars - November 5.docx

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Astronomy & Astrophysics
Michael Reid

November 5, 2013. Lecture 16 – Terrestrial Planets: Venus and Earth Venus  A paradise  Temperatures around 500 C  Dense dense water  Weather forecast o Overcast all the time o Reddish-orange sky o Little wind o No rain o Poles as hot as the equator o Night as hot as day o No seasons  Venus has no seasons o Almost no tilt, almost not variation when rotating around the sun  Compared to Earth o Only marginally smaller, almost the same size o Retained the same level of internal heat o Similar densities and compositions o Was thought to be the sister planet to Venus o Has volcanoes o Active geological processes have erased some craters  What is an “atmosphere”? o Layer of gas that surrounds a world o Earth’s atmosphere is 100km thick, but still fades out so
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