After weeks of reduced activity, the sun erupted with three powerful flares on a single day. That could send solar flares ...

The sun has dialed back its furnace to the lowest levels seen in the space age, new measurements from a space probe show. But don't worry — it's too small a difference to change life on Earth ...

After more than three weeks without a powerful solar flare, the sun has suddenly ramped up its activity, firing off three ...

A solar flare, which is a burst of radiation that accelerates charged particles away from the sun, travels at the speed of light, so by the time forecasters see it, it's already affecting Earth's ...

8. Speaking of sunlight, it’s composed of approximately 40 percent light, 50 percent heat, and 10 percent ultraviolet ...

Sun and colleagues wanted to see how lichen coped with bombardment by UVC radiation, so they placed a sample next to a UVC lamp for 3 months in a controlled setting.

Right now, Earth is about 3.1 million miles farther from the sun than it is in early January when it reaches perihelion, its closest point. Compared to its average distance of 93 million miles ...

The Earth is shielded by a magnetic field that makes the charged particles bounce from pole to pole, creating two gigantic donut-shaped belts populated by energetic electrons and protons. The ...

Our star, the sun, is a fundamental provider of energy to the Earth, shedding light, driving the weather and feeding green plants. Life could not exist here without it.

People tend to associate proximity with warmth, so it seems natural to assume the seasons are caused by changes in how far Earth is from the sun. But the planet’s distance has little to do with ...