The sun sure has woken up this week, unleashing a powerful X-class solar flare on Jan. 18 that hurled a colossal, fast-moving ...

The sun is the biggest object in the solar system; at about 865,000 miles (1.4 million kilometers) across, it's more than 100 times wider than Earth. Despite being enormous, our star is often called a ...

Is a sun a star or a planet? Current definitions define a star as a body that generates its own energy. While humans have relied on the sun for hundreds of thousands of years, it's only in the last ...

New research suggests there may be a narrow window of possibility for life to persist on the icy moons of the outer solar system. When you purchase through links on our site, we may earn an affiliate ...

This book is an astronomy text dedicated in 1478 by Christianus Frollianus, a court astronomer of Naples, to Giovanni of ...