CAPE CANAVERAL, Fla. -- An asteroid bigger than an aircraft carrier will dart between the Earth and moon on Tuesday -- the closest encounter by such a huge rock in 35 years.
Last updated Wednesday, September 14, 2011 - 11:01pm
WASHINGTON — NASA made official on Wednesday its next vision for space travel by unveiling plans for a massive rocket it hopes can blast astronauts to an asteroid by 2025 while laying the foundation for a future trip to Mars.