One of the things I loved about Art Bell's shows was his ability to bring-in people from across a spectrum of beliefs and specialties, and give them a platform to discuss their views. This is where I first learnt about Velikovsky's theories. While his view has taken a beating in recent years, perhaps science has finally caught-up with the outlandish tales Art gave voice to (as one recent account described his show.....)
Although this is the first compelling evidence for such a large body that has since disappeared, their existence in the early solar system has been predicted by planetary formation models. Moon- to Mars- sized planetary embryos have formed either by runaway41 and oligarchic growth of planetesimals or by pebble accretion in the first million years of the solar system. Mars-sized bodies (such as the giant impactor that formed the Moon) were common, and either accreted to form larger planets, or collided with the Sun or were ejected from the solar system. This study provides convincing evidence that the ureilite parent body was one such large “lost” planet before it was destroyed by collisons.
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