For the last 13 years, it has seen sights on Saturn that no other spacecraft has shown us. Here are some of the best images from Cassini's mission, so far. Video courtesy of NASA. Follow Tech ...

There is no surface below. Saturn's made almost entirely of hydrogen and helium gas, which is why it's called a gas giant. 4,000 kilometers above the surface, we hit Saturn's upper atmosphere.

Once it's dark, you'll only have a couple of hours to view them before Venus, Saturn and Neptune dip below the horizon for the evening. This applies regardless of location, so no matter where you ...