Huge asteroid on possible collision course with Earth (172 years from now), Christian Science Monitor

"An international team, including NASA experts, say in new research that the space rock has a one-in-a-thousand chance of an impact. They may sound like high odds, but they are enough to mean the threat from the 560-meter (612-yard) wide asteroid will have to be taken seriously."

Will a Giant Asteroid Kill Us All in 2182?, Time

"The future isn't looking bright, (ahem....) but here's a doomsday theory even skeptics can't totally deny: a massive asteroid, named the 1999 RQ36 was discovered in 1999 and has a width of over 1,800 feet. Scientists have said that this asteroid's impact could have a similar effect to that which allegedly wiped out the dinosaurs. Great."

NASA Workshop to Discuss Exploring Near Earth Objects

"NASA will host an interactive workshop to identify objectives for exploration missions to near-Earth objects, or NEOs, on Aug. 10-11 at the Renaissance Mayflower Hotel in Washington."

Live webcast