LOS ANGELES (Reuters) – NASA scientists said on Thursday they had definitive proof that water exists on Mars after further tests on ice found on the planet in June by the Phoenix Mars Lander. „We have water,“ said William Boynton, lead scientist for the Thermal and Evolved-Gas Analyzer instrument on Phoenix. „We've seen evidence for this water ice before in observations by the Mars Odyssey orbiter and in disappearing chunks observed by Phoenix last month, but this is the first time Martian water has been touched and tasted,“ he said, referring to the craft's instru­ments. NASA on Thursday also extended the mission of the Phoenix Mars Lander by five weeks, saying its work was moving beyond the search for water to exploring whether the red planet was ever capable of sustaining life. „We are extending the mission through September 30,“ Michael Meyer, chief scientist for NASA's Mars exploration program, told a televised news conference.