Harvard scientists explain how Mars had warm spells billions of years ago, allowing rivers and lakes to exist.

The alignment of six planets – Mars, Jupiter, Uranus, Neptune, Saturn, and Venus – this month has sky photographers abuzz.

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

Beautiful photos of the six planets aligned in the night sky have emerged online. Mars, Jupiter, Uranus, Neptune, Venus and ...

It’s a phenomenon known as a “planet parade,” where the planets appear to be marching across the night sky. Stargazers will be able to see Venus, Saturn, Jupiter and Mars with just the naked eye for ...

Thousands of mysterious clay mounds found on Mars were formed by ancient water on the Red Planet's barren northern plains, ...

In 2025, a rare celestial event called Planet Parade will occur from January 21 to 29, where Venus, Mars, Jupiter, Saturn, ...

Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day.

On Jan. 25, 2004, NASA’s Opportunity rover landed on Mars and sent its first pictures of the planet to Earth; originally ...

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

Starting at 12:30 p.m. ET (1730 GMT) on Saturday (Jan. 25), astrophysicist Gianluca Masi of the Virtual Telescope Project ...

The data used to create the image is from a Hubble Space Telescope project to capture and map Jupiter's superstorm system.