Finding Life Beyond Earth

00:18:04 It stays just long enough to grab a sample.

00:22:13 A protoplanet the size of Mars slams into early Earth.

00:25:27 STEWART: Over the past few years

00:28:49 spitting out tiny particles of ice and dust.

00:32:49 It's one of the building blocks for life.

00:36:21 towards the Kuiper Belt.

00:40:24 If it all melted, it would cover the whole planet

00:43:40 similar to those found in the Antarctic?

00:46:51 for organic molecules, the building blocks of life.

00:50:09 and if it still exists today.

00:54:13 Landscapes littered with hundreds of active volcanoes.

00:59:14 Voyager approaches Io, one of Jupiter's more than 60 moons

01:03:36 DAVIES: This continual flexing of the satellite

01:07:17 This small moon could have twice as much liquid water

01:11:08 There's nothing that I can think of

01:14:46 Cassini makes its way to one of the closer moons.

01:19:07 the three main ingredients for a habitable zone.

01:22:45 SHANK: The more we look at the extreme habitats on Earth

01:26:45 It's a question astrobiologist Chris McKay is investigating.

01:29:57 there's organic material, there's nutrients

01:33:41 completely obscures the light from the star

01:37:34 Planets are essentially dark.

01:41:01 that represent the Earth-sized planets we see in the cosmos.

01:44:32 is a truly uncountable number.