The discovery of quasi-moon PN7 has caused a stir on social media. A University of Oregon astronomy professor explains. what ...

But the objects in question are not only just asteroids, but also orbit the sun, following an almost exact path as Earth while always remaining close by. Because of the asteroid's small size, only 62 ...

The Earth often gets a few visitors in the solar system, but some stick around for a while. Here's what to know about the ...