Nasa comet chaser finds 'footprints' 2bn miles away By Roger Highfield, Science Editor (Filed: 18/06/2004) Giant "footprints" measuring about a mile from heel to toe have been found on a comet. The Stardust spacecraft reached comet Wild 2 in January after a six-year journey of two billion miles. Scientists expected to see a big chunk of rock and ice around three miles across, liberally coated with dark dust, obscuring any interesting features. Stardust flew less than 150 miles from the comet's heart and the first detailed analysis of the rendezvous, published today, describes the "feet" along with broad mesas, craters,...