What?! Now dirty snowball... Walt Thornhill was right.
http://www.thunderbolts.info/tpod/2006/arch06/060217deepimpact3.htm
http://www.thunderbolts.info/tpod/2006/arch06/060216deepimpact2.htm
http://www.thunderbolts.info/tpod/2006/arch06/060217deepimpact3.htm
http://www.thunderbolts.info/tpod/2006/arch06/060217deepimpact3.htm
"Today our view of the comet is greatly enhanced by the technological achievements of the twentieth century; but critical thinking—the ability to question theoretical assumptions—has collapsed to the point that astronomers barely notice the incongruities in coma behavior."
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From An Address Before the Graduate College Forum of Princeton University on October, 1953.
by Immanuel Velikovsky
"I like to tell this story. Once, in the twilight hour, a visitor came into my study, a distinguished-looking gentlemen. He brought me a manuscript dealing with celestial mechanics. After a glance as some of the pages, I had the feeling that this was the work of a mathematical genius. I entered into conversation with my visitor and mentioned the name of James Clerk Maxwell. My guest asked: 'Who is he?"
Embarrassed, I answered: "You know, the scientist who gave a theoretical explanation of the experiments of Faraday."
'And who is Faraday?" inquired the stranger.
In growing embarrassment I said: "Of course, the man who did the pioneer work in electromagnetism."
"And what is electromagnetism?" asked the gentleman.
"What is your name?" I inquired.
He answered: "Isaac Newton."
I awoke. On my knees was an open volume: Newton's Principa.
This story is told to illustrate what I have said before. Would you listen to anybody discuss the mechanics of the spheres who does not know the elementary physical forces existing in nature?
But this is the position adopted by astromomers who acclaim as infallible a celestial mechanics conceived in the 1660's in which electricity and magnetism play not the slightest role."
The varied supposed locations for materials found in the comet are particularly inconvenient data. ;')