When viewed silhouetted against the Sun, Mercury’s disk (seen at left on November 9, 2006) is clearly smaller than that of Venus (seen at right on June 5, 2012). Other dark markings are sunspots.

The transit of Mercury compared to the transit of Venus.


Montage Marc Jobin/Espace pour la vie; Mercure : Brocken Inaglory/Wikimedia Commons; Vénus : Marc Jobin


Espace pour la vie