Solar System Features
A few examples of what you can ask Wolfram|Alpha about:
Solar System Features
get information about a feature of a planet or moon
find features on a planet or moon
compare features on both sides of the moon
compare multiple features
compare features on several of Jupiter's moons
find the distance between features
Great Red Spot
find the current position of Jupiter's Great Red Spot
find the position at a specified time
get the time of a Great Red Spot event