Mercury surface resembles rare meteorites

Sep 24, 2012 Read more: MSNBC

Mercury has a surface unlike any other planet's in the solar system, instead resembling a rare type of meteorite, researchers say.

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“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Sep 26, 2012
This one is interesting for 2 reasons.

1st is that mercury is the result of a "splat" impact which left behind a giant iron core and a thin overlying shell of (initially molten) rock. The resulting surface rock is the result of diffrentiation of a starting pile with a bulk composition similar to the lower mantle. Enstatite chondrites are either rare because they were since knocked off the surface of mercury into solar orbit by a big impact; OR they formed at a particular pressure regime (low) in the lower mantle of a small body at a particular depth, making them a rare part of an asteroid mantle.

2ns interesting reason is its link to a potential large sungrazing comet (ISON) due in November 2013.

Have a nice day: Ag

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