News tagged with comet
Related topics: nasa , spacecraft , solar system , earth , asteroid
Comet
A comet is a Small Solar System Body that orbits the Sun. When close enough to the Sun, a comet exhibits a visible coma (fuzzy "atmosphere"), and sometimes a tail, both because of the effects of solar radiation upon the comet's nucleus. Comet nuclei are themselves loose collections of ice, dust and small rocky particles, ranging from a few kilometers to tens of kilometers across.
For more information about Comet, read the full article at
Wikipedia.
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Did ancient Mars have a runaway greenhouse?
Cosmic impacts that once bombed Mars might have sent temperatures skyrocketing upward on the Red Planet in ancient times, enough to set warming of the surface on a runaway course, researchers say.
Space & Earth / Space Exploration
May 24, 2012 |
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