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 ...

Our Sun emits light, heat, high-energy radiation and electrically charged particles into space that constantly bombard the ...

Ultraviolet (UV) light can severely damage the eyes, contributing to conditions such as cataracts, photokeratitis, and ...

While sunsets on Mars are uniquely moody, NASA 's Curiosity rover has captured a stunning image of a martian sunset, featuring light rays that illuminated a bank of clouds as the sun set over the ...