Are Late Heavy Bombardments rare?

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Are Late Heavy Bombardments rare?

Post by Sirius_Alpha on 17th November 2009, 11:59 pm

How Common are Extrasolar, Late Heavy Bombardments?
http://arxiv.org/abs/0911.3271

Abstract wrote:The habitability of planets is strongly affected by impacts from comets and asteroids. Indications from the ages of Moon rocks suggest that the inner Solar System experienced an increased rate of impacts roughly 3.8 Gya known as the Late Heavy Bombardment (LHB). Here we develop a model of how the Solar System would have appeared to a distant observer during its history based on the Nice model of Gomes et al. (2005). We compare our results with observed debris discs. We show that the Solar System would have been amongst the brightest of these systems before the LHB. Comparison with the statistics of debris disc evolution shows that such heavy bombardment events must be rare occurring around less than 12% of Sun-like stars.

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