While Nasa's Mars Exploration Rover Opportunity was travelling from Victoria crater to Endeavour crater, between September 2008 and August 2011, the rover team took an end-of-drive image on each Martian day that included a drive. This video compiles these 309 images, providing an historic record of the three-year trek that totalled about 21 km across a Martian plain pocked with smaller craters.
The video featuring the end-of-drive images shows the rim of Endeavour becoming visible on the horizon partway through the journey and growing larger as Opportunity neared that goal. The drive included detours, as Opportunity went around large expanses of treacherous terrain along the way.
The rover team also produced a sound track for the video, using each drive day's data from Opportunity's accelerometers. The low-frequency data has been sped up 1 000 times to yield audible frequencies.
"The sound represents the vibrations of the rover while moving on the surface of Mars," said Paolo Bellutta, a rover planner at Nasa's Jet Propulsion Laboratory, who has plotted many of Opportunity's drives and co-ordinated production of the video. "When the sound is louder, the rover was moving on bedrock. When the sound is softer, the rover was moving on sand."
Opportunity and its rover twin, Spirit, completed their three-month prime missions on Mars in April 2004. Both rovers continued for years of bonus, extended missions. Both have made important discoveries about wet environments on ancient Mars that may have been favourable for supporting microbial life. Spirit stopped communicating in 2010. Opportunity continues its work at Endeavour. Nasa will launch the next-generation Mars rover, car-size Curiosity later this year for arrival at Mars' Gale crater in August 2012.