Stargzers in the Philadelphia region are in for a double celestial treat this week with a rare comet and a mega supermoon set to shine in the night sky. "This could be a once-in-a-lifetime experience ...
The agency will invest approximately $5.2 billion in the entire life of the mission, which spans nearly two decades, beginning in 2015 and ending in 2034, according to a press release from NASA's Jet ...