Buy on Amazon Keep Exploring NOVA's "The Planets: Mars" Homepage Related to This Episode Finding Life Beyond Earth We are on the verge of answering one of the greatest questions in history: Are we ...

NASA's <I>Cassini</i> reveals the mysteries of Saturn's rings—and new hope for life on one of its moons.

NOVA scienceNOW: 10th Planet Viewing Ideas Before Watching Discuss the following questions as a class: Why is it important to have a clear definition of a planet?

The Red Planet was once a vibrant blue water-world, home to raging rivers, active volcanoes, and even an ocean. But as the young planet’s core cooled, its magnetic field and protective ...

The Planets: Saturn Season 46 Episode 15 | 53m 52s | CC NASA’s Cassini explores Saturn for 13 years, looping through its icy rings and flying by its moons.

Nova | The Planets: Inner WorldsUse one of the services below to sign in to PBS: You've just tried to add this video to My List. But first, we need you to sign in to PBS using one of the services ...

The PBS science series NOVA has earned three nominations for the 41st Annual News and Documentary Emmy Awards. The films nominated showcase timely and inspiring science storytelling that span both ...

Are we alone—and if not, what might the inhabitants of far-flung worlds look like? It’s a golden age for planet hunters: NASA's Kepler mission has identified more than 3,500 potential planets ...

In this video segment adapted from NOVA scienceNOW, learn about the debate over the definition of a planet. Historically, there has been no scientific definition for a planet, leaving astronomers ...

NOVA’s expert team looks for the signature of a volcanic eruption big enough to have blasted a huge cloud of ash and sulfuric acid into the atmosphere, which chilled the entire planet.

Outer Planets Planets beyond Mars, sometimes called the Jovian planets or gas giants due to their composition and size. These include Jupiter, Saturn, Uranus, and Neptune.