Handout image courtesy of NASA shows the planet Venus transiting the Sun, June 5, 2012. One of the rarest astronomical events occurs on Tuesday and Wednesday when Venus passes directly between the sun and Earth, a transit that won't occur again until 2117. REUTERS/NASA/AIA/Solar Dynamics Observatory/Handout (UNITED STATES - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS | Foto: Reuters