In a discovery that could qualify as one of the most important in the history of space exploration, NASA’s Phoenix Mission may have confirmed the presence of water ice on the planet, Popular Mechanics has learned. The scheduling of a press conference for Thursday at 2 p.m. Eastern by NASA and the University of Arizona has raised hopes in the space community that scientists will announce the breakthrough. When pressed for details, a spokesperson for the agency’s Jet Propulsion Laboratory refused to elaborate beyond saying that the Phoenix team would unveil new findings from the ongoing robotic mission to Mars....