* Oops. Steve beat me to the punch. But I have a few more details to mention.
* Velikovsky's books, Worlds in Collision, Earth in Upheaval, etc are what primarily led to EU theory. In 1968 Dave Talbott first read I.V.'s book/s and in 1972 he published a quarterly magazine, called Pensee': Velikovsky Reconsidered, which seems to have revived interest in I.V.'s ideas among scientists and laypeople, although Alfred DeGrazia had also joined with several scientists in writing The Velikovsky Affair in 1967, which showed mistreatment of I.V. especially among publishers and the media. In 1974 the AAAS, led from behind the scenes by Margaret Mead, its president, and openly by Carl Sagan, I.V.'s main antagonist, conducted a kangaroo court hearing (calling it a symposium) to "debate" I.V.'s findings. Although I.V. defended himself pretty well, mainstream science media and the general media claimed that I.V. was soundly defeated in the "debate". I learned within the last few years that Mead was a major proponent of global warming, as she talked at a global warming conference in 1975, if I recall rightly. I believe Sagan had popularized the notion that Venus' unexpectedly high heat was caused by the CO2 greenhouse effect. I.V., on the other hand, had claimed that Venus' heat was caused by its having been a new planet. So the global warmers apparently felt that they had to discredit I.V. in order to prevent scientists from considering his idea, instead of the greenhouse theory.
* Talbott's magazine, Pensee', covered the symposium in issue #7 fairly extensively and showed all the lying that went on there. There were ten issues of Pensee' in all. It folded in 1975. But, luckily, Kronos magazine took over at that time, based on the East coast, probably NJ. Talbott was in OR. Kronos had ten years of quarterly issues with many great articles, some by I.V. I think he had written for Pensee' as well. Aeon magazine took over after that and maybe SIS Review etc. Then came the Thoth email newsetter in the late 90s through about 2004, which then led to the Thunderbolts website.
* Velikovsky had mentioned electrical and magnetic effects between planets and moons during catastrophic planetary near encounters. And that led Ralph Juergens, an electrical engineer, to write several articles in Pensee' and Kronos about substantial evidence that rilles on the Moon were formed by electric discharges. He also wrote an article later suggesting that the Sun is the focus of electric discharge. Wal Thornhill and Don Scott added much more evidence of electrical phenomena in the universe thereafter and that sort of brings us up to date.
* Any more questions?