There’s never a cloudy day on WASP-96b. This hot gas giant may have the least cloudy skies on any exoplanet astronomers have ever seen, and consequently, that makes it a great place to plumb the depths and study in what might be happening below the planet’s clear skies.

“By ‘clear’ we mean cloud-free, which means the actual atmosphere is moderately see-through,” says Nikolay Nikolov at Exeter University in the UK.

Tiffany Kataria at NASA’s Jet Propulsion Laboratory in Pasadena, says, “This is one …