Discovering the first true "alien Earth" is a long-held dream of astronomers — and recent exoplanet discoveries have shown that small, rocky worlds like our own are abundant in the galaxy. Let’s look at some of the closest known analogues to our home planet. --- Support this podcast:...

NASA's Kepler Space Telescope was an observatory in space dedicated to finding planets outside our solar system, with a particular focus on finding planets that might resemble Earth.