The Hubble Space Telescope, HST, is an important tool for studying Saturn, its rings, satellites, and magnetosphere in support of the Cassini mission. Using remote control from the ground, astronomers are able to point the telescope at targets of interest and make observations to obtain data to solve the scientific problems of interest.
Resolution refers to the ability to observe fine detail.
Since it is above our atmosphere's molecules and aerosols, the scattering of light that can make things harder to see with groundbased telescopes does not occur. Being above Earth's atmosphere offers the additional advantage of permitting observations in ultraviolet light. This is a region of the spectrum that is carries a lot of information about chemical composition and some types of magnetospheric activity. UV is absorbed by the atoms and molecules in Earth's atmosphere. Servicing missions in the future will replace the instruments with even more capable ones.