Every day, a huge, dazzling ball of fire crosses the sky. In today’s modern world, few of us stop to consider this amazing fact. However, in ancient times, this mysterious ...

Even if Earth does survive, it won’t be pretty. The temperature of our planet will be about 1,300 degrees C, hot enough to ...

But all known chemical and gravitational sources of energy were too short-lived. A revolution came in the 1930s, ... Recently other discoveries about the Sun’s core have come to light.

The sun is the greatest source of blue light. Natural blue light helps regulate your circadian rhythm, or wake-and-sleep cycle. Sunlight is also instrumental in children's eye development.

About 99.999% of the light that creates a suntan comes from the sun; the rest comes from the Big Bang and galaxies throughout the universe.

Besides the sun, there are numerous celestial sources of UV radiation. Very large young stars shine most of their light in ultraviolet wavelengths , according to NASA .

You may know them by the acronym ROY G BIV. Together, they make the white light you see when the sun -- the main source of blue light -- is shining. Fluorescent and LED (light-emitting diode ...

How you can tell the time of day from shadows cast by the sun. The sun is our main source of light. Nuclear reactions at the core of the sun create energy in the form of heat and light.

Sunflowers famously turn their faces to follow the sun as it crosses the sky. But how do sunflowers “see” the sun to follow it? New work from plant biologists at the University of California, Davis, ...