QUESTION:
What is the next probe to visit Neptune?

ANSWER from Robert Mitchell on December 21, 1995:
There is no probe currently scheduled to go to Neptune. There are some studies
underway that could lead to the development of such a mission, with possible
launch dates between '05 and '10. Options being studied include both an
atmospheric probe with a relay craft that would fly past the planet, or an
orbiting mission similar to Galileo.