Worlds in Collision
Velikovsky proposes:Immanuel Velikovsky, Worlds in Collision, “Facing Many Problems” (1950)

“I have endeavoured to show that two series of cosmic catastrophes took place in historical times, thirty-four and twenty-six centuries ago, and thus only a short time ago not peace but war reigned in the solar system.”
“We maintain also that one planet — Venus — was formerly a comet…
“… that it joined the family of planets within the memory of mankind”
“We conjectured that the comet Venus originated in the planet Jupiter”
“From the fact that Venus was once a comet we learned that comets are not nearly immaterial bodies”
“We claim that the earth’s orbit changed more than once and with it the length of the year;”
“… that the geographical position of the terrestrial axis and its astronomical direction changed repeatedly”
“… the polar regions shifted, the polar ice became displaced into moderate latitudes, and other regions moved into the polar circles.”
“… electrical discharges took place between Venus, Mars, and the Earth when, in very close contacts, their atmospheres touched each other;”
“… that the magnetic poles of the earth became reversed only a few thousand years ago”