Example image of eyePlorer eyePlorer map for 'Space probe': Sun Hohmann transfer orbit Gravity assist Interplanetary Transport Network Mariner 9 Mars Cassini–Huygens European Space Agency Huygens probe Titan (moon) 2004 2005 December 25 January 14 Geology Mars Exploration Rover Opportunity rover Spirit rover 2007 January 24 February 6 1977 September 5 Voyager 1 NASA Jupiter Saturn Earth 1000000000 (number) 2008 Astronomical unit May 9 Metre Jet Propulsion Laboratory Escape velocity Interstellar probe Pioneer 10 Pioneer 11 Voyager 2 Bracewell probe Comx-35 CONTOUR Core rope memory Deep Impact (space mission) Deep Space 2 Don Quijote (space probe) European Space Operations Centre Exploration of the Moon Helios probes Human versus robotic spaceflight