Extreme heat warnings and heat advisories were issued across parts of the U.S. Southwest and Pacific Northwest on Friday.

Millions of California residents are being warned to avoid sun exposure as an extreme heat wave is expected for much of the ...

Over the next two nights, a widespread display of the northern lights will dance across parts of the U.S., including.

The next time you see the UV index in the weather forecast, look more closely. You can protect yourself from too much sun.

Aurora conditions may be strong enough over the next few nights that the norther lights could be seen visually and with cameras. Here’s when to look up and gaze at the sky.

Scientists say 4 billion people experienced at least one extra month of extreme heat because of human-caused climate change ...

WASHINGTON (AP) — Get ready for several years of even more record-breaking heat that pushes Earth to more deadly, fiery and ...

An Extreme Heat Warning is in effect from 9 a.m. Friday until 11 p.m. Saturday as highs hit 104° and Southern Nevada sees its first "major" heat risk of the year.

The sun's corona—the outermost layer of its atmosphere, visible only during a total solar eclipse—has long intrigued ...

Nasa is warning of extreme space weather that could cause blackouts across the planet, as the Sun's hottest region is to turn ...