About 880 light-years from Earth, a hot mess of an exoplanet is slowly spilling its atmosphere into space, creating two enormous tails of helium that stretch more than halfway around its star.
The planet, WASP-121b, is some 900 light-years away in the constellation Puppis. The team has now probed deep inside Tylos's atmosphere and revealed distinct winds in separate layers, forming a map of the atmosphere's 3D structure.
