Over the past week the earth has had near misses from three separate asteroids. The closest one was just 38,300 miles away, for comparison, the distance between the earth and the moon is 239,000 miles. This asteroid was only 25 feet wide, along with one of the asteroids that flew by just a day before. However the second asteroid of the previous day was 100 feet wide and missed earth by a distance of just 217,000 miles. But rest assured, NASA says this stuff happens all the time.