The Ken Than article in space.com also on CNN.com tells about an exoplanet (around a star other than our own) that is a "gas giant" around Upsilon Andromeda, a star some 40 light years away. The trick is that it seemingly has a sunlit side temperature between 2500 and 3000 F (1400-1650 C) and -4 to -450 F on the dark side (they think it is tidally locked, so the same side always faces its star). The planet has a "tight orbit" and goes around every 4.6 days.
If it is a "gas" giant, and the gas is heated to some 3k F, how can it have such a cold other side. I can see that for a rocky planet, but gases expand and move when hot, and condense and sink when cold. Why would there be no circulation that moderates the temperatures? Any ideas? http://www.cnn.com/2006/TECH/space/10/13/fire.ice.planet/index.html
2006-10-15
14:46:54
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2 answers
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asked by
Rabbit
7