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Unformatted text preview: are diff. than those of other planets b/c Venuss atmosphere is so thick that only objects 2-3 KM in diameter are able to make it through to the planets surface. Its very unlikely that global warming will ever cause Earths atmosphere to experience the runaway greenhouse effect like Venus has, but our environment is very fragile. The moon & Mercury undergo extremes in temp b/c theyre both lacking atmospheric blankets. This results in very warm days & cold nights. Most astronomers believe the Moon originated when a Mars-sized object collided w/the newly formed Earth. The moon formed from the collision & ended up staying in the Earths orbit. Due to synchronous orbit, the Earth would appear almost stationary to an observer in the nigh sky. It would, though, be changing its appearance b/c it would still be rotating....
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- Spring '08