Martian `marbles` may have parallel on Earth
Marble-sized pebbles found by Nasa's Mars rover Opportunity appear to have counterparts on Earth, which adds powerfully to evidence that the Red Planet was once awash with water, a study published
Marble-sized pebbles found by Nasa's Mars rover Opportunity appear to have counterparts on Earth, which adds powerfully to evidence that the Red Planet was once awash with water, a study published