A Nasa website for scientists to help them chose potential landing sites on Mars is becoming a great hit with the public as well. Scientists preparing for Nasa’s next Mars mission, the twin Mars Exploration Rovers scheduled for launch in June and July 2003, have created Marsoweb to enable them to view more than 44,000 high-resolution images of the red planet. Mars provides a wealth of exciting landing sites, but most of them present surface hazards to the current generation of landers. The images combine all the available data about the surface of Mars allowing researchers to fly through its canyons and valleys or over its volcanoes and desert dunes.