Astronomers were to share their knowledge and enthusiasm for space by encouraging as many people as possible to look through a telescope at planetary neighbours.

They are, of course, impervious to reason; it's futile to warn them that they risk forcing our planetary neighbors to act against us in self-defense.

This video answers one of the most frequently asked questions about our planetary neighbor.

Unlike our other planetary neighbor, Venus, which remains shrouded in cloudy mystery, the red planet has invited speculation and exploration.

The humans on Earth began their search for cosmic companions first by building telescopes with which they could see their immediate planetary neighbors.

Increasingly, scientists say, the large Jovian moons are proving to be more surprising and interesting than Earth's planetary neighbors.

How Mars Works Since the 1960s, we've been captivated by our planetary neighbor.

We have no planetary neighbors, which fact undoubtedly helped shape our development.

It turns out the Krll are really interested in a planetary neighbor of yours.

A mission to our nearest planetary neighbor provides the best opportunity to demonstrate that humans can live for extended, even permanent, stays beyond low Earth orbit.