"Are we alone?" This ancient question has occupied humanity's mind for a long time. In 1995, the discovery of the first ...

There have never been so many satellites orbiting Earth as there are today, thanks in part to the launch of mega ...

People always want to know what will happen to Earth when the sun eventually swells up as a red giant. For one thing, the ...

How is it possible for the ISS to stay in orbit? Learn more about the science behind orbiting Earth and more in this NASA ...

Have you ever wondered why all the planets in our solar system orbit the Sun in roughly the same flat plane? This fascinating ...

A large sunspot has just reappeared on the sun's Earth-facing surface, almost two months after it first emerged. The ...