Satellites beaming sunlight down to Earth sound like science fiction – and they have astronomers very worried.

The company promises to produce "sunlight on demand" with mirrors that beam sunlight down to Earth so solar farms can operate ...

When Earth is opposite Mars from the sun, it will appear full because you’re looking directly on the daylit side. But ...

Earth moves 2 million miles closer to the sun from summer to winter, yet temperatures drop 40+ degrees. The answer lies in Earth's tilt.

The Sun’s poles may hold answers to long-standing mysteries about magnetic cycles, solar wind, and space weather. The polar regions of the Sun remain one of the least explored areas in solar science.

A proposed constellation of satellites has astronomers very worried. Unlike satellites that reflect sunlight and produce light pollution as an ...

Gamma-Ray Bursts are the most energetic explosions known in the universe and they release intense gamma radiation, it could ...

Fountains from the south vent at Kilauea’s summit crater soared 1,300 feet (400 meters) into the air, the U.S. Geological ...

One particularly memorable account of failure there described temperatures of twenty degrees below zero and winds that drove ...

Astronauts reported seeing a mysterious light during a space mission, and NASA has now confirmed the real explanation behind the unusual sight.

Sunlight streams across the kitchen countertop where I am making sandwiches for today’s hike. The sun seems to lose ambition after a long summer, flattening its arc so that it shines from a lower ...

The full moon of October, called the Hunter's Moon, will grace our skies on Oct. 17 —and it will be a "supermoon" as well.