The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But ...

A very rare treat is about to grace Earth's night skies.

Planet Nine", dubbed, has fascinated scientists for its ability to account for "anomalous" motions of objects located faraway ...

Sometimes, it's easy to forget that we're spoiled with one of the best observatories in our solar system, and it's called ...

A planet parade like the one beginning tonight is quite uncommon, occurring once every 10-20 years. Here are the planets you ...

Emily Simpson has loved space since she was a 10-year-old kid celebrating her birthday at a planetarium. Now a recent Florida ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the ...

such as how on Earth we send signals to planets like Mars in our solar system to talk to rovers and spacecraft. "Any time that two planets are aligned might be interesting," says Tusay.