Two such lunar canyons, Vallis Schrödinger and Vallis Planck, stretch over 270 km (168 miles) each, with depths of 2.7 km ...

"I'll always remember the first time I saw those iridescent clouds and was sure at first it was some color artifact." ...

For most of history, the Moon was regarded as a mysterious and powerful object. Then scientists made it into a destination ...

Many photos McCarthy has taken of the space station in the past show the ship as a silhouette in Earth's shadow. This time he ...

Hollywood legend Kevin Costner ruminates on President Teddy Roosevelt in the new Fox Nation limited series 'Yellowstone to Yosemite.' ...