I saved Saturn for last because it was when space probes reached its vicinity--starting with Voyager 1--that they at last found a live world, when they turned a camera back towards Terra: the Earth. It's that distant dot in the first photo, blown up in the inset upper left. The second photo is from Voyager, and the third is color enhanced. What Carl Sagan called this "pale blue dot" is where all known life in the solar system resides. All known life in the galaxy. In the universe, though we admittedly don't know much about that.
Here's more of what Carl Sagan wrote about these photos: "Our planet is a lonely speck in the great enveloping cosmic dark...This distant image of our tiny world...underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've got."