Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

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 ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

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

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

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

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...