The European Space Agency has published results from findings of the Mars Express and Huygens probes.
There are strong hints that liquid water-ice exists deep underground on Mars. Existence of water is a prerequisite for extended stays on Mars, e.g. colonies, where the settlers will have to live off the land.
The Huygens probe, that was hitching a ride with the Cassini Saturn orbiter, discovered that Titan is, in many respects, similar to Earth.
Congratulations to ESA with the success of these missions, and the groundbreaking science that they have provided.