Tuesday, May 27, 2008

Theory Suggests Earth Had Three Moons

Planetary scientists at NASA and the Carnegie institute believe the Earth once had three moons, according to a report at Cosmos Magazine.

The extra two moons would have been small, about 100km across and appear as two "extremely bright stars" at 10 and 2 o'clock around the moon we see today. Think of a giant Mickey Mouse icon in the night sky.

According to the leading theory, the moon was created when a mars-sized proto-planet collided with the Earth 4.4 million years ago. While a lot of debris would have been circling the Earth after this cataclysm, the small moonlets or "Trojans" in question here would have stuck around for a few hundred million years.

Eventually, the Trojans (named after similar bodies circling Jupiter) would have disintegrated and fallen into the moon. This would explain some of the freshest craters on the moon.

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2017.6.24

Pound360 Archive

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I started pound360 to channel my obsession with vitamins, running and the five senses. Eventually, I got bored focusing on all that stuff, so I came back from a one month hiatus in May of 2007 (one year after launching Pound360) and broadened my mumblings here to include all science.