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

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Stargazers will be treated to a dazzling six-planet "alignment" this January.

Baker said that there are other astronomical events that may be more interesting than the parade of planets. Baker said Mars ...

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

While claims of a “rare alignment” are overblown, you can still see up to six planets in the night sky this weekend. Here's ...