PITTSBURGH — Find a jacket and possibly an ice scraper before heading out to the car this morning. Some areas are seeing their first frost of the season today, with temperatures in the 30s in much of ...

A solar eclipse unsettles the natural world in ways you might not expect. As the moon crosses paths with the sun, the sudden ...

These hot August nights can be great for stargazing. Here’s a look at what’s going on above us right now and later in the month. The expression “dog days” refers to the period from July 3 through Aug.

Sunlight is often perceived as a threat to your health, but research suggests exposure to sunlight may actually be beneficial in small doses.

Fifty-five years after the first Earth Day, climate activists organized a nationwide celebration of solar power. Fifty-five years after the first Earth Day, climate activists organized a nationwide ...

The cycle of day and night governs life on Earth, but in some regions, a remarkable phenomenon occurs where the sun never sets for weeks or even months at a time. Known as the midnight sun, this ...

Why are we asking for donations? Why are we asking for donations? This site is free thanks to our community of supporters. Voluntary donations from readers like you keep our news accessible for ...

From Seattle to Baltimore, many Americans were celebrating Monday as Indigenous Peoples Day, determined to see it as a ...

These hot August nights can be great for stargazing. Here’s a look at what’s going on above us right now and later in the month. Lawrence Livermore National Lab enters a different kind of space race ...