Immanuel Velikovski, a Russian born psychiatrist, proposed a series of unlikely astronomical events, not the least of which was the ejection of the planet Venus from Jupiter. Now Jupiter has an escape velocity of 59.5 km/sec so the energy needed to spit out Venus would likely have blown the planet to bits but the story gets better. Venus, according to Velikovski, had several close encounters with Earth before settling into it's now near circular orbit.
Immanuel Velikovsky
What Carl Sagan has to say about Velikovsky
Immanuel Velikovsky
What Carl Sagan has to say about Velikovsky