The closest potentially habitable worlds: Proxima Centauri b at 4.2 light-years, Barnard's Star b, Ross 128b, Wolf 1061c, Tau Ceti, and the Breakthrough Starshot plan.
From a planet made of diamond to worlds with oceans of lava, these 10 exoplanets are the strangest places astronomers have found beyond our solar system — and what they teach us.
