"This is, incidentally, why we sometimes observe planets appearing to approach closely to each other on the sky, as we view ...

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, ...

This January and February, a rare planetary alignment featuring Venus, Mars, Jupiter, Saturn, Uranus, and Neptune will be ...

Mars will be making its closest approach to Earth in two years, and thus, the mighty red planet, named for the god of war ...

Mars, Jupiter, Uranus, Neptune, Venus, and Saturn—will align in a rare celestial parade, visible for weeks. A seven-planet ...

Venus, the second-brightest object in the sky, appeared 110 times brighter than Saturn. The two planets were close enough to ...

A new study suggests that a planet-sized object may have passed through the solar system billions of years ago.

Since the middle of the month, four of the five brightest planets in the night sky have been visible after sunset and will ...

On the evening of February 28, stargazers will witness a rare celestial event: an alignment of seven planets visible ...

Although the planets won’t form a perfectly straight line, their simultaneous visibility in a single part of the sky will be ...