A mere 200 light-years away, there's a planet with the density of styrofoam and clouds of sand. How did it get so weird?
The James Webb Space Telescope's first year of observations promises to reveal exoplanet atmospheres and surfaces, infant galaxies, and maybe even the first black holes.
At the extremes: A hot Jupiter reveals extreme chemistry on a sizzling world, and a cold Jupiter sheds light on giant planet formation.
Two independent teams of astronomers have discovered the signature of water vapor in the atmosphere of super-Earth K2-18b.
This week in astronomy news: Inflated helium atmospheres surround two exoplanets, and the Kepler Space Telescope captures the moments around a supernova that hint at a companion star triggering the explosion.