Five asteroids are on track to pass within 4.6 million miles of Earth in the coming days, and NASA’s planetary defense system ...

To truly understand what an asteroid is made of, we need to send a probe to it. Remote sensing from ground-based telescopes, or even orbiting observatories, can only do so much. A new white paper ...

Astronomers don’t treat every “close approach” headline the same way the public does. On June 9, two near-Earth objects, 2026 LD and 2026 KM3, are being tracked as they pass Earth at distances ...