Exoplanets and the Search for a Second Earth - The Search for Life in the Universe Documentary
Astronomers have just identified a nearby solar system hosting seven Earth-sized planets. Most intriguing: Three planets that orbit its central star — known as TRAPPIST-1 — may even be within a habitable zone. That means they fall within a region that could support life as we know it. As such, these newfound worlds are good sites to focus a search for alien life.
TRAPPIST-1’s big planetary family also hints that many more cousins of Earth may exist than astronomers had thought.