A view of a memorial to victims of the Sept. 11, 2001, attacks on the World Trade Center towers was taken on Mars on Sept. 11, 2011, on the 10th anniversary of the attacks.
A view of a memorial to victims of the Sept. 11, 2001, attacks on the World Trade Center towers was taken on Mars on Sept. 11, 2011, on the 10th anniversary of the attacks.