Astronomers have found a space rock that has been quietly hanging around Earth for decades: a tiny asteroid named 2025 PN7. This so-called “quasi-moon” isn’t a true moon or a mini-moon, because it ...

Researchers have theorized that far away from us in our solar system there might be a mysterious planet, dubbed Planet 9, orbiting. One of the things that some scientists have used to support the ...

Although the term itself immediately conjures the sort of alchemy at the heart of the best sci-fi fantasy, celestial mechanics —- the numerical nuts and bolts of how planetary bodies move, orbit and ...

The planets of our solar system all orbit the Sun within a few degrees of a flat plane extending out from our star’s equator — its equatorial plane. That makes sense. Our solar system began as a ...

"This is really like looking at ourselves in a funhouse mirror." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Skewed planetary pathways around ...

The eight planets in our solar system (yes, it's still weird for me to write "eight," too) orbit the sun in roughly circular paths, although they're ever-so-slightly ellipses instead of circles. A new ...

Our Solar System is like a fried egg. With the Sun at the center, the planets all orbit the Sun on roughly the same plane. We call this the ecliptic—it’s a line in the sky from east to west, and it’s ...