We are saddened by the loss of retired NASA astronaut Gene Cernan, the last man to walk on the moon. Cernan, commander of Apollo 17, died today, Jan. 16. "We leave as we came, and, God willing, we shall return, with peace and hope for all mankind." -- Cernan's closing words on leaving the moon at the end of Apollo 17 Credit: NASA #nasa #apollo #apollo17 #space #moon