Twenty-two states will experience elevated ultraviolet (UV) radiation levels on Tuesday, according to the National Weather Service (NWS) and the Environmental Protection Agency (EPA). According to the ...

A research team from Penn State has broken a 165-year-old law of thermal radiation with unprecedented strength, setting the ...

In Chicago, for example, the sun has been setting before 4:30 since November 16. The city will see its earliest sunsets — 4:19 p.m., according to NOAA — on December 2 and 3.

UV radiation comes primarily from the sun and is made up of UVA, UVB, and UVC rays. UVC rays do not reach Earth, but both UVA and UVB rays pose health risks. Learn more here.

But after that, the sun will slowly start setting later in the day. By December 31, sunset will be at 4:29 p.m., NOAA reports . It’ll take until January 28 for sunsets to happen after 5 p.m.

BASKING IN THE sun has been considered a health hazard for at least four decades. The main risk comes from ultraviolet (UV) light, which the Sun emits alongside visible radiation. This can ...

This weekend, the sun rose at 2:51 a.m. on Saturday, but it didn’t set Saturday night, and Sunday marked the first calendar day that featured 24 hours of nonstop daylight.

Exposure to the sun's UV radiation may have a positive effect on fertility in women aged 30-40 . In a pioneer study, the ovaries of women in the late reproductive age range ...

When Daylight Saving Time begins and we push the clocks ahead at 2 a.m. on Sunday, March 9, the sun will rise just about an hour later. But, we’ll get an extra hour of daylight in the evening to ...