Nasa's Curiosity Mars rover imaged these high-altitude clouds on 17 May ... after the booster that propelled the rocket into space failed to land on a platform in the ocean.

Clouds are categorized into three main groups based on their altitude: cirrus, cumulus, and stratus. Cirrus clouds are ...

In the late 1940s, the notion of space travel remained squarely in ... Browse a gallery of the U.S. Air Force's high-altitude balloon experiments and the researchers, scientists, and test pilots ...