QUESTION:
With the observer, were you able to find anything about Jupiter's surface?
Especially how big it is, compared to the outer atmosphere. 

ANSWER from Laura Barnard on April 1, 1997:
Galileo has not provided us any new information on the possible solid
surface of Jupiter.  We are not even sure if Jupiter has a _solid_ core or
not.  If it does, its radius is estimated to be only about 7000 km while
the equatorial radius of the planet's entire envelope of atmospheric gas
is about 71,400 km (compared to 6,000 km for the Earth).  This is the
radius out to the top of the atmosphere to the one-bar atmospheric
pressure level, i.e, the "altitude" above the center of Jupiter where the
pressure is the same as that usually encountered at the Earth's surface.
So you would have to dive down about 60,000 km into the planet before
getting to a solid surface! If you look at a publication at school you
will find that Jupiter is a "gas giant", and as such is mostly made of
hydrogen and helium gases and fluid. 

The Galileo probe that landed in Jupiter's atmosphere last December made
measurements only within the upper 150 km or so of the atmosphere before
it melted in the extreme heat and pressure.  It obtained no information
about the very deep interior where any possible solid core might reside.
The Galileo orbiter's instruments can only sense information about the
upper cloud layers near the top of the atmosphere.