Universe

Episode
Alien Worlds: The Search for Second Earth
Broadcast Info
2021 (59 mins)
Description
Humans have long gazed up at the night sky, wondering whether other lifeforms and intelligences could be thriving on worlds far beyond our own. Answering that question seemed fated to remain pure speculation. But over the last few decades, ultra-sensitive telescopes and dogged detective work have transformed alien planet-hunting from science fiction into hard fact. Gone are the days of speculation, the hunt for E.T. has become a matter of serious scientific inquiry. As the hunt for alien worlds began, we expected to find worlds similar to the planets in our own solar system, but instead we discovered a riot of exotic worlds. Vivid animation based on data from the most successful planet hunter of them all, the Kepler space telescope, brings these worlds into view: puffy planets with the density of Styrofoam, unstable worlds orbiting two suns, and thousand-degree, broiling gas giants with skies whipped into titanic winds. But perhaps the most startling discovery was the number of worlds that may be contenders for a second Earth. Our latest survey of the galaxy estimates that there are billions of rocky planets at the right distance from their sun to have that ingredient so crucial for life as we know it, liquid water. Amongst them, we witness the most tantalizing discovery of all: a so-called ‘Super-Earth’, situated in the Goldilocks zone - just the right distance from their sun where life might be supportable, and the faint signal of water in its atmosphere. With over 2,800 exoplanets confirmed by Kepler and discoveries still rolling in, Brian lays out his own answer to the age-old question with thrilling new science: Are we alone?
Genre
Science; Astronomy; Cosmology

How to cite this record

The Open University, "Universe". https://learningonscreen.ac.uk/ou/search/index.php/prog/240493 (Accessed 10 Jan 2025)