... Tonight's Sky . ... Star Atlas . ... stars . ... Hubble slices layer cake . New Hubble Space Telescope observations will help astronomers study the layered atmosphere of an exoplanet. ... T he powerful vision of NASA's Hubble Space Telescope has allowed astronomers to study for the first time the layer-cake structure of the atmosphere of a planet orbiting another star. Hubble discovered a dense upper layer of hot hydrogen gas where the super-hot planet's atmosphere is bleeding off into space. ...