Three missions, 20 years in space, 4.9 billion miles traveled, and nearly a half-million photographs taken. Those are just a few of the figures Space.com throws out about the day of what it deems the "bittersweet" demise of the Cassini space probe, which, on its last fumes of fuel, hurled itself into the depths of Saturn Friday morning in a mission of self-destruction. During its space run, Cassini gathered valuable information about the planet, including data on dust particles, reports on Saturn's plasma, and the ins and out of the planet's electromagnetics. It also dropped about 8,000 pounds over the long haul—mostly due to its dwindling fuel supply and dumping another probe onto the moon Titan. More coverage on the probe's "grand finale":