Science Mysterious 'ball' on Mars: Where did it come from?

NASA says that a remarkably spherical rock spotted by the Curiosity Mars rover is a sign that the Red Planet harbored water in its ancient past.

By , Universe Today

NASA/JPL-Caltech/MSSS

It seems too round to be true — the Curiosity rover has found a ball-shaped object among the craggy rocks in its picture. This image was taken on Sol 746 of the rover’s mission on Mars, which so far has extended over two Earth years.