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 ...

Because of the sun's positioning in the days just before, during and after the equinox, those looking down east-west roads in Chicago and the suburbs will be able to see the sun framed by much of the ...

Much as we may treasure and proclaim our independence, we actually live in a protective bubble called the heliosphere.

Monday is the first day of Fall for us in the northern hemisphere. It is the first day where there will be more darkness than ...