Although exploration by remote, in situ spacecraft has been the primary too
l used in scientific exploration of the planets and other solar system obje
cts for the last three decades, the unique capabilities of the Hubble Space
Telescope (HST) have made it an invaluable tool for solar system research
and have led to many important discoveries. HST's extended lifetime has mad
e it possible to continue observations of planets and satellites that were
started by earlier space missions and has thereby provided new insight into
dynamic surface and atmospheric phenomena on these bodies. The ultraviolet
capability of HST has made it possible to study important time-variable ph
enomena such as the auroras on Jupiter and Saturn and the circulation of pl
anetary atmospheres. This review provides an overview of HST observations o
f and discoveries relating to planets and satellites in the solar system.