Two twin Hycean planets--that is, Ocean planets with Hydrogen atmospheres. They are seen with a telescope from an interstellar space probe orbiting another planet in the system.
Both are superearth (~9x Earth mass, ~3 Earth radii) planets orbiting the M3V red dwarf star TE-346.
TE-346 c (foreground) has hydrochloric acid rich oceans and a chlorinated atmosphere, thought to be the result of some form of extremophile microbial life in the ocean. The chlorine in the atmosphere causes the cyan tint along the limb and the yellow tint on the clouds.
TE-346 c is tidally locked, keeping one side always facing the star. Consequently, atmospheric superrotation and constant heating on the day side produces a symmetrical pattern of vortices west of the substellar spot.
TE-346 d (background) is almost the same mass and density as c, but was at some point subject to a giant impact which tilted it and spun it up to near breakup speed, resulting in the extremely oblate or lenticular figure. Its satellite and ring system is expected to be short lived due to stellar tides.
