Luckily, there's no need to worry about this Phaethon scorching the planet anytime soon. Though it is large and classified as 'potentially hazardous', it made its closest pass by Earth on December 16, at a distance of 6.4 million miles. That's 27 times farther away than the moon. Researchers discovered Phaethon in 1989, and think that it did come closer to Earth in the past, getting as near as 3.2 million miles back in 1931. It's not expected to come 'close' to Earth again until 2093.