The autumnal equinox arrives Monday, marking the start of the fall season for the Northern Hemisphere and the spring in the ...

Regulus, a distant star, Venus and our moon will be visible during a conjunction tonight, and how Californians can best see it.

Earth has a number of mini-moons and quasi-moons. Mini-moons are objects that orbit our planet. But they make for fickle fans: They tend to swing around Earth for only a matter of months. One example ...

A space weather expert has warned that a sudden solar 'micronova' could trigger tsunamis, climate chaos and mass extinction, revealing exactly how the devastating event would play out.