QUESTION : 
What would be harder to overcome if you were to put people or probes on
Neptune, the freezing weather or the storms?

ANSWER from Sanjay Limay on april 25 :
If we were to use currently available technology, probably neither, but what 
do you mean by "putting people or probes on Neptune?"  People and probes are 
not synonymous in terms of the problems they pose.  If you were to send 
people to Neptune, do you want them to come back?!  They cannot "land" on 
Neptune since there is no surface.

The factors to be considered for sending either people or "unmanned" probes 
include the following: mass and volume requirements, time spent in cruise to 
Neptune, power requirements during cruise, communication requirements during 
cruise and probe entry, acceptable temperature range inside the probe, 
vibration levels sustainable during launch and entry phases.

Voyager 2 took 12 years after launch to get to Neptune by getting 
gravitational assists from Jupiter, Saturn and Uranus.  This was a fast 
trip, compared to what a direct trip to Neptune would have required.  You 
can see that unless the humans were hibernating all that time (leaving aside 
the problem of getting them back to earth), just the food and waste disposal 
issues alone are insurmountable!  Can you imagine how much food you would 
consume during a 12 year trip?  Unmanned probes on the other hand do not 
require to be fed for sustenance, and only the thermal and radiation 
environments are of any concern.  The Galileo Probe to Jupiter provides an 
illustration.   The nearly 1000 kg probe survived a trip of nearly six 
years, a launch on the space shuttle, a rocket launch in space, separation 
from the mother spacecraft and entry into the Jupiter's atmosphere at nearly 
100,000 km/hour.   During this time, the temperature inside the probe did 
not drop below a level that would have damaged the instruments.   After 
entry the probe soon came into equilibrium with the atmosphere and was 
moving with it.  It is thus possible to sustain rather large winds in 
different atmospheres, but given the long trip to Neptune, power 
requirements to maintain temperatures at a survivable level would pose a 
problem in terms of weight unless radioactive batteries were employed.