Cosmic Journeys — The Search for Earth-like Planets

Get the latest from the planet-hunting frontier. Find out what we are learning about our place in the cosmos from the search for earth-like planets. This journey started tens of thousands of years ago, when humans began to fan out across the planet, following unknown pathways, crossing unmeasured distances. We traced coastlines, and sailed uncertain seas. We crossed ocean straits drained by an ice age.