120,000 km Is Still Too Close

texchanchan writes: "BBC report: '...on 14 June, an asteroid (maybe as big as 120 meters in diameter)... made one of the closest-ever recorded approaches to the Earth. ..' but was only discovered three days later. This is well within the moon's orbit. 'If 2002MN had hit the Earth, it would have caused local devastation similar to that which occurred in Tunguska, Siberia, in 1908...'"