

Giant Jupiter visible to the eye

1:19 PM, Nov. 21, 2012
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Astronomers have discovered more than 800 planets orbiting other stars. They're called extrasolar planets or exoplanets and the vast majority of them are strange, alien worlds.

The most common exoplanets are so-called "Hot Jupiters," meaning they are massive, gaseous planets, 1,000 times larger than the Earth, that revolve very close to their parent star. They can complete one orbit in hours unlike the Earth, which takes an entire year. The Hot Jupiters may or may not be the most common planets in the galaxy - they are simply the easiest planets for astronomers to detect.

Smaller, ...

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