We weren't in danger of losing a chunk of our planet to asteroid 2019 OK, but it was detected just the day before it slipped past, and that's the worrying part. The European Space Agency had enough time to ask two telescopes in the International Scientific Optical Network (ISON) to take a look at the asteroid right before its flyby. These aren't beauty shots. The asteroid looks like a dark blob, but the observations are helping us learn more about 2019 OK. We now know the asteroid flew by at a distance of just 40,000 miles (65,000 kilometers). Cosmically, that's...