TO GO WITH AFP STORY BY LAURENCE COUSTAL / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA / BILL INGALLS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
(FILES) In this handout photo released on May 9, 2016 by the NASA, the planet Mercury is seen in silhouette, lower third of image, as it transits across the face of the sun, as viewed from Boyertown, Pennsylvania. - BepiColombo mission to Mercury is scheduled for launch on an Ariane 5 from Europe's Spaceport in Kourou, French Guiana on October 20, 2018. (Photo by BILL INGALLS / NASA / AFP) / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA / BILL INGALLS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS