A byproduct of aging nuclear weapons stockpiles could help power spacecraft on missions lasting decades. Americium-241, an ...

Physicists are quietly rewriting the rulebook for how we might cross the gulf between stars, not by bolting bigger rockets to launch pads but by probing the strange limits of quantum theory. A new ...

In 2026, astronauts will travel around the Moon for the first time since the Apollo era, powerful new space telescopes will prepare to survey billions of galaxies, and multiple nations will launch ...

It’s a big universe out there—13.8 billion years old, full of hundreds of billions of star-and-planet-packed galaxies and, out past the limits of our sight, perhaps infinite in all directions. But as ...