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Space scientists John Chambers and Jack Lissauer of NASA's Ames Research Center hypothesize that along with Mercury, Venus, Earth, and Mars -- the terrestrial, rocky planets -- there was a fifth terrestrial world, likely just outside of Mars's orbit and before the inner asteroid belt.
"The extra planet formed on a low-eccentricity orbit that was long-lived, but unstable," Chambers reported. About 3.9 billion years ago, Planet V was perturbed by gravitational interactions with the other inner planets. It was tossed onto a highly eccentric orbit that
crossed the inner asteroid belt, a reservoir of material much larger than it is today.
Planet V's close encounters with the inner belt of asteroids stirred up a large fraction of those bodies, scattering them about. The perturbed asteroids evolved into Mars crossing orbits, and temporarily enhanced the population of bodies on Earth-crossing orbits, and also increased the lunar impact rate.
After doing its destabilizing deeds, Planet V was lost too, most likely spinning into the Sun, the NASA team reported.
Originally posted by KKing123
maybe it was Mars sized and when the theorized orbital destabilization happened it impacted the Earth? Half of that is the presently accepted explanation of where the moon came from
Mars-sized object probably created the Moon
16 August 2001
Our moon almost certainly formed from matter ejected from the Earth after a collision with a large body. Previous studies have failed to determine what kind of object this might be, but a highly accurate model has now found that a collision with a body the size of Mars could account for the features of the Earth and the Moon. According to Robin Canup and Erik Asphaug, the discovery further strengthens the impact theory because objects of this size were reasonably abundant in the early solar system (R Canup and E Asphaug 2001 Nature 412 708). physicsweb.org...
Originally posted by Hoppinmad1
Because the impact of a mars size planet collided with earth supposedly and ejected molten earth into orbit that created the moon.