On Jan 5, 1:06 pm, Tom Adams <[email protected]> wrote:
> Can you cite something, anything, that claims that Earth protected
> Venus from icy asteroids?
Following from my previous post, it is not that Earth acted as a
backstop. It is that the eccentricity only extended the orbits inwards
as far Earth.
I have found a paper which may have been the first I read about this:
Nature 435, 466-469 (26 May 2005) | doi:10.1038/nature03676; Received
6 December 2004; Accepted 18 April 2005
Origin of the cataclysmic Late Heavy Bombardment period of the
terrestrial planets
R. Gomes1,2, H. F. Levison2,3, K. Tsiganis2 & A. Morbidelli2
It says on page 467:
"However, our scheme probably also produced an in flux of material
from the asteroid belt. As Jupiter and Saturn moved from 1:2 MMR
towards their current positions, secular resonances (which occur when
the orbit of an asteroid processes at the same rate as a planet) swept
across the entire belt. These resonances can drive asteroids onto
orbit with eccentricities and inclinations large enough to allow them
to evolve into the inner Solar System and hit the Moon."
>From that I assumed that the inclinations were large enough to hit
Earth but not large enough to hit Venus.
Cheers, Alastair.
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