Editorial: A river ran through Mars

From finding a trail of evidence supporting the presence of water on Mars a few billion years ago, Curiosity’s discovery of subrounded or rounded pebbles provides definitive proof that the red planet once had a river. According to a May 31 paper in Science, multiple exposures of a sedimentary rock (conglomerate) containing densely-packed rounded pebbles, … Continue reading Editorial: A river ran through Mars

Rounded pebbles on Mars point to water flow

For the first time ever, scientists have been able to collect unequivocal evidence that water had once flowed on Mars some three billion years ago. Observations by NASA’s Mars rover Curiosity have revealed pebble-rich rock exposures that are so very characteristic of a riverbed. The round-shaped pebbles embedded in a matrix of coarse-grained sand are … Continue reading Rounded pebbles on Mars point to water flow