NOVA | July 2023

The rocky planets — Mercury, Venus, Earth and Mars — were born of similar material around the same time. Yet only one of them supports life. Were Earth's neighbors always so extreme? And is there somewhere else in the solar system life might flourish?
Mars was once a blue-water world studded with active volcanoes. But when it’s magnetic field and protective atmosphere faded, it became the frozen desert planet we know today. With so many necessary elements in place, did life ever form on Mars?
Jupiter’s massive gravitational force made it a wrecking ball when it barreled through the early solar system. But it also shaped life on Earth, delivering comets laden with water — and perhaps even the fateful asteroid that wiped out the dinosaurs.
Over the past 40 years, a handful of space probes have given us glimpses of Saturn. But NASA’s Cassini, which explored the gas giant’s realm for 13 years, delivered the most breathtaking new insights. NOVA takes you inside Cassini’s epic journey as it makes stunning discoveries: Saturn’s rings are younger than the dinosaurs and may be remnants of an ice moon. And geysers erupting ic and gas on the moon Enceladus shows it could have all the ingredients for life.