An asteroid came within 120,000 km of hitting the Earth last Friday, June 14th. That is well within the Moon's orbit, only the 6th object ever recorded to have approached that closely, although other objects were much smaller. What is even more alarming is that the asteroid was not detected until three days later. The asteroid only had a diameter of 200-300 feet, but at a speed of 23,000 miles an hour it would have caused devastation comparable to the asteroid that struck Siberia in 1908. This is pretty scary when you think about it, especially when you realize that even if you could detect something this small, there is a "blind spot" caused by the Sun that could prevent us from ever finding objects in certain portions of the night sky.