Titan

The news came hours after the announcement that debris from the Titan, collected from the seafloor more than 12,000 feet below the surface of the North Atlantic, had arrived in Newfoundland.

The Titan, a minivan-size submersible, was carrying five people to the Titanic's watery grave when it lost contact. The vessel has enough oxygen to keep its passengers alive for about 40 more hours.

Following on Cassini's discoveries, NASA aims to probe Jupiter's Europa for potential life. With every new world we discover, we should look back at our own planet with awe, says Marcelo Gleiser.