Asteroids sweep past Earth, one of them coming closer than the moon. USA TODAYStadium-sized asteroid to buzz by Earth on Saturday: 5 things to know The HillNewly discovered asteroid larger than the Great Pyramid of Giza will zoom between Earth and the moon on Saturday Livescience.comESA - Close approach of asteroid (415029) 2011 UL21 European Space AgencyLarge asteroid to pass between Earth and the moon on Saturday CBC News