An illustration of the hazy, pink-hued gassy giant GJ504b, which may be a massive planet or a brown dwarf orbiting a nearby ...

But is it a planet or what?

These noctilucent clouds, reflecting light from the sun after sunset, have been visible in Martian skies for the past four fall seasons. Credit: NASA / JPL-Caltech / MSSS A rover got a new view of ...

In a major first, scientists have detected water vapor and possibly even liquid water clouds that rain in the atmosphere of a strange exoplanet that lies in the habitable zone of its host star about ...

The weather on the gas giant Ditsö̀ is literally alien. Clouds of solid quartz appear and disappear thanks to silicon and oxygen atoms continually evaporating from and then condensing in its ...