There was a whole lotta movin' and shakin' going on in the inner part of
the early solar system, according to two new simulations. If the models
are
correct, this new and dramatically more violent view of terrestrial
planet
formation could have consequences for understanding several puzzles,
including why Mars isn't as heavy as Earth or Venus.
Two teams of researchers began their work by trying to address a
long-standing mystery. According to the standard model of planet
formation, Mars
ought to be five to 10 times as massive as it actually is.
The standard model assumes that the swirling disk of gas, dust and ice
that circled the young sun and out of which the planets condensed had a
continuous, relatively smooth distribution of material. David Minton and
Hal
Levison ... challenged that assumption with a model in which the
planet-forming
disk had a gap in it at about the distance from the sun where Mars now
resides.
Read more:
http://ow.ly/2PYF2
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