SpaceX and Blue Origin are years away from putting astronauts on the moon. Four other companies may get there first.

While SpaceX is not the sole new launch company, it has set the pace for reducing the cost and increasing the reliability of ...

Twenty years ago, the Huygens probe achieved humanity's first landing on a moon in the outer solar system when it touched ...

How the first moon landing was saved. The story of the people who made Apollo 11 happen ...