I know for a scientific fact Venus was a comet.
"As when the son [Jupiter] of devious-devising Kronos [Saturn] casts down a star [Venus], portent to sailors or to widespread armies of peoples gliterring, and thickly the sparks of fire break from it, in such likeness Pallas Athene swept flashing earthward and plunged between the two hosts; and amazement seized the beholders, Trojans, breakers of horses, and strong-greaved Achaians." -- Homeros, poet, Iliad, Book IV: 75-80
"As Zeus's [Jupiter's] daughter [Venus] she'll be immortal and live in heaven with her brothers, Pollux and Castor, the heavenly twins, an extra star for ships to steer their courses by." -- Euripides, playwright, Orestes, 408 B.C.
"Democritus however, insists upon the truth of his view and affirms that certain stars [Venus] have been seen when comets dissolve." -- Aristotle, philosopher, Meteorology, 350 B.C.
"Some of the Italians called Pythagoreans say that the comet is one of the planets [Venus]." -- Aristotle, philosopher, Meteorology, 350 B.C.
"In an ancient Hindu tablet of planets, attributed to the year -3012 Venus among the visible planets is absent [Delambre, J.B.J., Histoire de l'astronomie ancienne I, Page 407, 1817: 'Venus alone is not found there.']." -- Immanuel Velikovsky, polymath, 1950
Reiner, E.,
Enuma Anu Enlil, Tablet 63: The Venus Tablet of Ammisaduqa
Bargmann, V., and Motz, L.,
On the Recent Discoveries Concerning Jupiter and Venus, Science, Volume 138, Pages 1350-1352, Dec 1962
Jastrow, R.,
Velikovsky: A Star-Crossed Theoretician of the Cosmos, The New York Times, Dec 1979
Podgorny, I.M., Dubinin, E.M., and Israelevich, P.L.,
Laboratory Simulation of the Induced Magnetosphere of Comets and Venus, Earth Moon and Planets, Volume 23, Number 3, Pages 323-338, Nov 1980
Russell, C.T., Luhmann, J.G., and Elphic, R.C.,
The Distant Bow Shock and Magnetotail of Venus: Magnetic Field and Plasma Wave Observations, Geophysical Research Letters, Volume 8, Number 7, Pages 843-846, Jul 1981
Saunders, M.A., and Russell, C.T.,
Average Dimension and Magnetic Structure of the Distant Venus Magnetotail, Journal of Geophysical Research, Volume 91, Number A5, Pages 5589-5604, May 1986
Russell, C.T., Luhmann, J.G., and Elphic, R.C.,
Magnetic Field and Plasma Wave Observations in a Plasma Cloud at Venus, Geophysical Research Letters, Volume 9, Number 1, Pages 45-48, Jan 1982
McComas, D.J., et al.,
The Average Magnetic Field Draping and Consistent Plasma Properties of the Venus Magnetotail, Journal of Geophysical Research, Volume 91, Number A7, Pages 7939-7953, Jul 1986
McComas, D.J., et al.,
Magnetotails at Unmagnetized Bodies: Comparison of Comet Giacobini-Zinner and Venus, Journal of Geophysical Research, Volume 92, Number A9, Pages 10111-10117, Sep 1987
Fritzius, R.S.,
Is Venus a New Planet?, American Astronomical Society, Volume 39, Page 1044, Dec 2007
Interesting questions...