An astronaut aboard the International Space Station took this oblique photograph of polar mesospheric clouds during one of the 16 sunsets visible from the station each day. Polar mesospheric clouds, ...

The air around and above us always has some water vapor and some particles in it. The particles could be dust or salt or even ...

NORFOLK, Va. — As we dive into the cooler months, there's always that chance we can see rain, snow, sleet or even freezing rain as the days start to get colder. But there's a reason why we could end ...

High in the atmosphere of Venus, a swirl of sulfur-containing clouds blankets the planet. Dark spots in these clouds correspond with areas of high ultraviolet light absorption, but researchers have ...

Around 4.5 billion years ago, the Solar System formed in the midst of the chaos of an early universe. As objects flung through the eddies of space, our own planet survived several massive impacts. One ...