These Nephilim, are spoken of in the book of Giants (preportedly written by Enoch, Noah's Grandfather). The book of Enoch was considered apocriphylic (meaning...secret) by the Council of Laedocia, in something like 398 AD. Here's a link to the manuscript
http://www.nazarene.net/enoch/
Also, more info on Planet X and Nephilim can be found here:
http://www.mt.net/~watcher/
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: Edited By Robinhood: There are times when I can just envision
: the smile forming on the face of readers when someone
: mentions planet X or the Annunaki or Nefilim. Nevertheless,
: man began to mysteriously leap from the cave man to
: knowledge and science almost overnight. This leap

: corresponds to literature found in the Surmerian Epic of
: creation or Enuma Elish. It states rather convincingly,(at
: least to me), the original twelve tribes were created using
: genetic technology we possess now to fertilize the womb of
: primitive creatures and advance them genetically.
: Their writings left behind indicate the nazca airfields in
: Peru and even the temple of Jupiter in Lebanon were landing
: fields for advanced aircraft. Ancient carvings on rock in
: these areas show men in spaceships. This holds true for the
: mayan pyramids.
: Who had the technology to build these monuments?
: It also explains why we see stories of giants in the bible.
: It also explains why the bible refers to people living
: thousands of years.
: This is explained in the Sumerian Epic. Having come from a
: planet with a large eliptical orbit, they did not age as
: fast as life forms on the earth.
: To me this explains why in Genesis, we are told the sons of
: God found the daughters of the earth fair and begin to
: marry them.
: Eventually these bloodlines disappeared among the peoples of
: the earth over time.
: Christianity tells us that we were formed of clay. The
: American Indians tell us they are the descendants of super
: natural beings who came from the stars. Their primordial
: chant is something like lulululu. Interestingly, the
: genetic scientists who traced the DNA back to a single
: woman, refer to her as lulu.
: You tell me who is operating under the correct hypothesis!
: Incidentally the symbol of the Cheyenne Indian is a circle
: containing a balanced cross. The cross denotes, planet of
: the crossing or Nibiru, Marduk, planet X, as it is referred
: to today.
: Many of the paintings of the great masters also show
: spaceships in the background. Why is this?
: One of the Michelangelo paintings, I forget the name was
: spirited away in the Vatican vaults as it showed the
: Madonna holding twin children and a spaceship in the
: background. Now granted the Pope considered Michelangelo to
: be somewhat crazy, as he insisted that Jesus had a twin.
: Could the virginity of the Virgin have resulted from
: artificial insemination from the Nefilim? You tell me.