After closely studying this newly released NASA photograph of the Martian surface, Christian Macé, of France, discovered his second new anomaly.
It comes hot on the heels of a dolmen-like find he made early last month.
This time NASA's Mars Exploration Rover Opportunity had traversed southward toward Victoria Crater when it used its microscopic imager to obtain a mosic of pictures 6 centimeters (2.4 inches) square.
Writes Chrsitian:
"At down and on the left from this photo, there is a form like a BLACK ARROW! I have environed with black this strange form."