We know that there is no life on Mars. The Viking robot missions to the Red Planet proved that. The mission was (1)________to one man for the most part. Percival Lowell, a rich American businessman, suggested that Mars contained life. He was fascinated by Mars. He spent 23 years studying it. He was so (2)________involved in the search for Martian life that he built his own laboratory. It housed a huge telescope. At 7,000 feet (2.13km) (3)________sea level in a dry climate, it was a perfect site to view Mars. Lowell believed that he saw a network of lines (4)________Mars. He also thought that the lines were built by intelligent life. There was also the chance that water was on the planet. He drew many maps in his notebooks. His idea (5)________the public's attention. People soon believed that life on Mars could exist.