An asteroid gave Earth a close shave on Sunday, just a day after astronomers first spotted the object.The newfound asteroid 2016 QA2 zoomed within 50,000 miles or so of the planet. For perspective, the moon orbits Earth at an average distance of 239,000 miles.Astronomers think 2016 QA2 is between 80 and 180 feet wide. That means the space rock is slightly...