QUESTION:
Do you know if bacteria exists on Neptune and if not does it evolve?

ANSWER from Heidi Hammel on April 25, 1996:
We have no evidence that bacteria exist on Neptune.  The atmosphere of
Neptune (and all the other Gas Giant planets: Jupiter, Saturn, and Uranus)
is very different from that of our Earth (in size, comption, temperature,
and pressure).  It is difficult to imagine that any kind of life as we
know it has ever existed or will exist there.  More likely places to
look in the Solar System for otheare Mars, Jupiter's moon Europa, and 
Saturn's moon Titan.

Another ANSWER from Chris Burrows on April 26, 1996:
Neptune is a gas giant planet.  That means that it doesn't have a surface
(at least until the pressures are enormous).  It is also very cold.  So it
certainly couldn't support any life form like those on earth, which all
require liquid water.  Who knows what other strange chemistry for life is
possible.  We certainly have no idea what life could look like in such a
hostile place.  So I'd say that its very unlikely, but maybe I'm just
limited by my imagination.