X-rays from nuclear explosions can protect Earth from asteroids
An asteroid heading toward Earth can be deflected without ever touching a spacecraft. The trick is to use X-rays to […]
Physics
Tech companies want small nuclear reactors. Here’s how they would work
To feed artificial intelligence’s voracious appetite for energy, tech companies are turning to small nuclear reactors. Last week, Google and
A near-Earth asteroid provides clues to a dark matter theory
A hypothetical “fifth force” could attract asteroids, if it exists. But asteroid Bennu shows no signs that its orbit has