Human-made debris left behind in outer space is a growing problem down on Earth From defunct satellites to rocket parts, debris from everything humans have launched into space since the 1950s is ...

The three-body problem is a centuries-old physics question that puzzled Isaac Newton. It describes the orbits of three bodies, like planets or stars, trapped in each other's gravity. The problem is ...

How great would it be if we could extract resources from our waste products? Or even better, raise them from the ashes? Scientists in the United States have suggested doing exactly that to boost the ...

In some ways, the stars above us are the ultimate equalizer: we're all equally far away, we all share the right to look up at them; and, tiny glittering pinpoints that they are, when we contemplate ...