"The Voyagers have been deep space rock stars since launch, and we want to keep it that way as long as possible!" ...

In the coming years, an unprecedented number of people will leave planet Earth—but it’s becoming increasingly clear that deep space will make us sick.

This story appears in the November 2016 issue of National Geographic magazine. In winter the temperature at the poles of Mars can reach 200° below zero Fahrenheit. But make no mistake: The red ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. NASA’s twin ...