Based on his interpretation of ancient sources, Immanuel Velikovsky argued famously that Venus had emerged from Jupiter as a comet; interacted with the Earth and Mars in the second and first millennia BC, causing the Bronze Age catastrophes; and then finally settled into a nearly circular orbit of the Sun.
Three lines of reasoning support a Revised Venus Theory.
First, instead of the various unpersuasive suggestions that Velikovsky and others have made for how a cometary Venus could have emerged from Jupiter, we should consider the possible consequences of the immense gravitational field of Jupiter, which pulls toward it a stream of asteroids and comets, as with Shoemaker-Levy 9 in 1994.
n and scientific researcher Kenneth J. Dillon explains his The Martian Theory of Mass Extinctions. For most of the past 4 billion years, the orbits of Mars and Earth were more eccentric than at present, and they intersected. The closest approaches of Mars led to the great mass extinctions of prehistory, while more distant approaches might account for many minor extinctions as well. The theory shows why the extinctions were serial events, why they differed in size, how they shaped the surface of Mars, and what made them so terrifically devastating. For further information, see https://www.scientiapress.com/extinctions.