Perihelion is the point at which an orbiting body is closest to the sun. The word comes from Greek and literally means around ...

Earth's climate has swung between ice ages and warmer periods for millions of years, driven by subtle changes in our planet's ...

Astronomers have produced the first continuous, two-dimensional maps of the outer edge of the sun's atmosphere, a shifting, ...

An idea about the sun’s magnetic field called the terminator model could help predict dangerous space weather more accurately ...

Longyearbyen, Norway, and Ushuaia, Argentina, offer travelers the opportunity to see unspoiled landscapes, rare wildlife, and vast glacial ice—along with a spirit of endurance and camaraderie.