A very rare treat is about to grace Earth's night skies.

Seismic readings of the interior of Mars strongly suggest large quantities of water buried 6 to 12 miles underground.

A rare planetary parade where all seven planets temporarily line up on the same side of the Sun is happening on February 28, ...

As the rover moved, it used a process known as ground penetrating radar (GPR) to map up to about 260 feet ... landing site in the distant past on Mars (left) and how long-term physical and chemical ...

As the night progresses, more planets will fade. Mars will be the last planet visible. We have two illustrations to help visualize the planetary alignment: 1. An annotated night sky map showing the ...