Mars is home to the tallest mountain in the Solar System, Olympus Mons, an extinct volcano three times as tall as Mount ...

The idea of terraforming Mars—essentially reshaping the planet to support Earth life—has captured imaginations for decades.

For years, scientists have puzzled over how Mars lost the thick atmosphere it once had. That atmosphere was essential for ...

(See how NASA's new Mars rover will explore the red planet.) But, why ... star” crossing the sky in the third millennium B.C.E., they noted its foreboding color and associated it with the ...

The second half of the 19th century was a particularly interesting time to imagine Mars. This was a period during which the red planet seemed to be ready to give up some of its mystery. Astronomers ...

Elon Musk will address thousands of SpaceX employees in Texas on Tuesday, May 27. Here's how to watch the talk from home.

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

A crewed mission to Mars would rank among the most complex and costly undertakings in human history -- and US President ...

A series of planets will align in the early morning skies before sunrise through July 4, including Jupiter, Uranus, Mars, Neptune, Saturn, the dwarf planet Pluto and the moon. The rare parade of ...