For centuries, humans have wondered about the possibility of other Earths orbiting distant stars. Perhaps some of these alien worlds would harbour strange forms of life or have unique and telling histories or futures
Browsing: Kepler
Twenty years ago, we thought that the solar system, with its collection of planets — which then included now-demoted Pluto — was unique. But in the past few years, new data, aided by planet-hunting spacecraft Kepler, has shown that, not only are there billions of planets in the universe, in the Milky Way they are also