The search for extraterrestrial life has long gone back and forth between scientific curiosity, public fascination and outright scepticism. Recently, scientists claimed the “strongest evidence” of ...

Plants mastered the art of harvesting sunlight billions of years ago, using elegant rings of pigments in their leaves. Now, ...

Climate extremes are changing sunlight and UV levels in Lake Tahoe, affecting clarity, ecosystems and lake management.

If you feel like you've seen more of the northern lights painting the night sky lately, you'd be right—and there's an ...