Why We Track Asteroids Like the One That Flew by This Week
originally this week , on March 8 , asteroid 2013 TX68 came within about 3.1 million miles of Earth , astronomers estimate . Original predictionssuggested its closest glide slope might be within the orbits of geostationary satellites around the Earth , or it could be as far away as 9.5 million mile . Additional data modify the length range to between 3 million and 15,000 mile . At about 100 feet in diam , the aim was too small to be seen at the 3....