Beginning with the possibility that maybe Mars isn't as dry as it has seemed. Indeed, perhaps "Parts of Mars's interior are as wet as Earth's." Studies of meteors of Martian origin indicate that:
... the mantle from which the meteorites derived contained between 70 and 300 parts per million (ppm) of water. Earth's mantle, for comparison, holds roughly 50-300 ppm water, researchers said.
Since living systems are more complicated than non-biological processes, the idea was to look at the experiment results from a purely numerical perspective. They found close correlations between the Viking experiment results' complexity and those of terrestrial biological data sets. They say the high degree of order is more characteristic of biological, rather than purely physical processes.
The official conclusion of the Viking mission, of course, was that the Viking Labeled Release experiment could be explained by chemistry, without recourse to asserting that Martian life had been found.
|Jupiter (plus Ganymede & Callisto)|
(And as an engineer, I'm impressed with Juno's ability to function with only solar power, so far from the sun, rather than the radioisotope thermoelectric generator that powered Galileo. Inverse-square laws are strict!)
Saturn you ask?
As summer heats up (in my native hemisphere, anyway), a trip to the lake is often welcome. If you're looking to cool off, here's just the thing: "Lake detected near equator of Saturn's Titan." Despite the equatorial location, that lake should do nicely. Rather than water, the liquid in the lake is methane (boiling point: -182 degrees C). Discovery courtesy of the Cassini probe.
Uranus? Neptune? If there's recent news about them, I (and Google) seem to have missed it.
On to Pluto ... the demoted. The dwarf planet. It's the only (onetime) planet yet to be visited by a human-built probe. But a probe is on its way, and "Out in Deep Space, New Horizons Practices the 2015 Pluto Encounter."
Truly, we live in interesting times (and not only for the slow-motion train wreck that is the Eurozone).