Sunlight on Earth changes over decades, affecting climate, agriculture, and energy production, including solar power.

The sun rises each day, but the amount of sunlight reaching Earth’s surface is not as constant as we might think. A new study ...

In one of the world's largest star-gazing sanctuaries, Māori guides connect travelers with the cultural and spiritual significance of the cosmos.

Aurora could be seen in the night sky as a severe geomagnetic storm erupts over Earth. Here are the best places to see the ...

The Montana Department of Environmental Quality has rejected a petition filed by two river advocacy groups seeking an impairment designation for the Big Hole River tied to nutrients pollution.

This article was originally published on The Conversation, an independent and nonprofit source of news, analysis and commentary from academic experts. Disclosure information is available on the ...

The industrially ravaged Gowanus Canal, long regarded as a symbol of urban environmental neglect, is being reimagined through ...

The northern lights were visible farther south than normal Tuesday, April 15, and they'll be visible again for some residents tonight, April 16.