QUESTION: From it's vantage point in the Jovian system, is Galileo able to observe the outer planets and their moons (Saturn, Titan, etc.) better than ground based telescopes can? ANSWER from Rosaly Lopes-Gautier on January 26, 1996: Galileo's instruments were not really designed to look at bodies from a great distance - so we are concentrating on observing Jupiter and the Galilean satellites. We are not even observing all of Jupiter's other moons. Although there would be some value on this, we are concentrating our efforts on finding out a lot about Jupiter and its largest moons. For example, my instrument (NIMS) obtains spectra and we wouldn't really get worthwhile spectral information by looking at something very far away. Besides, all of the instruments have limited amounts of observing time, so we have to choose carefully what we look at. NASA is sending a mission to study Saturn and its moons: it will be launched in 1997. It's called Cassini, you may have heard about it. Another thing you have to consider is that spacecraft carry small telescopes! We are always limited by the mass of the instruments we can put on a spacecraft. So, space missions are not really designed to look at objects from a great distance.