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

Because the period of an object does not depend on its mass, comets’ orbital periods remain unchanged due to mass loss.

Six of our cosmic neighbors are expected to line up across the night sky tonight, in what has been dubbed a "planetary parade ...

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

The six planets will be visible in the days immediately leading up to Jan. 21, and for about four weeks afterward. Mars, ...

Venus, Saturn, Jupiter and Mars are all visible after sunset, but social media claims about it being a rare "planetary ...

January continues to be a remarkable month for stargazers. According to NASA, this month provides a unique opportunity to view multiple bright planets in one vi ...

Research by astronomers, led by the University of Geneva (UNIGE), challenges current theories about the formation of ...

Pluto may have got romantic to capture its largest moon, colliding and engaging in a passionate but icy 10 hour kiss with ...

Two significant additional discoveries-the identification of twin water worlds, Kepler-138c and d, and the existence of water ...

Smaller gas giants are less likely to survive in such systems, surrounded by clashing planetary titans. With their lower ...