It’s a scenario straight out of a Hollywood blockbuster, an asteroid is careening towards Earth and is set to wipe out human existence. To mark Asteroid Day, here are four space rocks on a collision course with our planet. The United Nations fears that the possibility of an asteroid smashing into a densely populated area isn’t being taken seriously enough, so it designated June 30 as International... 

Russia’s space agency wants to send a mission to Apophis, the notorious asteroid which may change its course and eventually collide with Earth. It will plant a radio beacon, which will help track the celestial body and assess the risks it poses. ­The 300-meter-wide asteroid first made headlines in 2004, when NASA reported that it has 1 chance in 223 of impacting on our planet in 2029. It was even...