Stadium-sized asteroid buzzes by Earth on Saturday: 5 things to know KTLA Los AngelesAsteroids to pass by Earth this week, one closer than the moon USA TODAYESA - Close approach of asteroid (415029) 2011 UL21 European Space AgencyTwo Killer Asteroids Are Flying by Earth, and You May Be Able to See One The New York TimesLarge asteroid to pass between Earth and the moon on Saturday CBC.ca