ESA wants to send a spacecraft to watch asteroid deflection experiment
The odds of Earth being struck by an asteroid are remote, but the effects of such collision can range up to a planetary catastrophe
Asteroid a half mile long about to make closest pass by Earth
The space rock flying by Thursday is thought to be a dead comet as big as the Burj khalifa
NASA’s plan to bat away Earth-bound asteroids
Some missions might even need to be launched a year before impact