Tiny Asteroid Discovered Just Yesterday "Virtually Certain" to Have Harmlessly Impacted Earth

For just the second time in history, an asteroid was discovered before it impacted the Earth. Don't panic: It was very small, probably just a few meters across, and burned up harmlessly in our atmosphere. But after events of the past year, it underscores the need to keep our eyes open. The asteroid is (well, was) named 2014 AA, the very first asteroid discovered this year. It was detected by the Mount Lemmon Survey using a 150 centimeter (60 inch) telescope located on a mountaintop in Arizona. T...