Glow of an exoplanet may be from starlight reflecting off liquid iron

Enlarge / Artist impression of a glory on exoplanet WASP-76b. (credit: ESA)

Do rainbows exist on distant worlds? Many phenomena that happen on Earth—such as rain, hurricanes, and auroras—also occur on other planets in our Solar System if the conditions are right. Now we have evidence from outside our Solar System that one particularly strange exoplanet might even be displaying something close to a rainbow.

Appearing in the sky as a halo of colors, a phenomenon called a "glory"...