This image was taken by the Arecibo Radar Telescope in Puerto Rico on April 2010. It shows an asteroid the size of an aircraft carrier on direct interception course with Earth's orbit. The arrival day: November 8. This is its trajectory.
We're going to put someone on an asteroid by 2025. Crazy. But the gravity on asteroids is so weak that we won't stick to it. NASA plans to harpoon an asteroid like a giant space-whale. Now that's my kinda crazy!