By Eric Ralls – earth.com
On January 14, 2005, the European-built Huygens probe touched down on Titan, Saturn’s largest moon. With that single landing, it became the first and only human-made object to land on the ground in the outer solar system.
Titan sits far from us, roughly 750 million miles (1.2 billion kilometers) away at typical distances, and it wears a thick, orange atmosphere that once hid its surface from view.