Through the end of February, all the planets in our solar system will visibly align in the sky, like a trope taken straight ...

January brings a stunning spectacle for star watchers, a rare celestial alignment wherein several planets appear across the ...

The universe is vast and our journey to understand it has just begun.

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

Mars, Venus, Jupiter and Saturn should be visible to the naked eye, but get a telescope and you can spot Neptune and Uranus.

Why does its southern hemisphere rise significantly above the smoother northern plains? A groundbreaking study using seismic ...

Mars' southern hemisphere absorbs a lot of the sun's energy during the Red Planet's spring, and that may be causing Mars' ...

Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of ...

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

While planets circle the sun in what's called a heliocentric orbit, they rarely fall together in what appears to the human eye as somewhat of a line across the visible horizon. Saturday is one of ...

Although it's being mistakenly promoted as a "rare planetary alignment," one of the best "planet parades" in half a century ...

Planetary alignments aren't rare, but they can be when they involve six of the eight planets in our solar system.