Earth Day activities in Las Vegas included the unveiling of winning student artwork selected to appear on the Exosphere of the Sphere.

The record-breaking mission offers an unprecedented opportunity to study the geology of our planet’s largest layer.

Kosmos 482 has been orbiting the Earth for decades. It's still unknown if the craft will fall to Earth intact or burn up upon ...

The very first Earth Day was celebrated on April 22, 1970. About 20 million Americans joined rallies, cleanups and teach-ins ...

While space junk and meteors routinely veer toward a crash-landing on Earth, most of the objects disintegrate as they’re torn apart due to friction and pressure as they hit Earth’s thick ...