A Near-Earth Object is an asteroid or comet that is in an orbit that sometimes brings it close to the Earth. The largest of these are known as Potentially Hazardous Objects as they could cause significant damage if they impacted our planet. There are sometimes news reports of a “close approach” where an object passes particularly near the Earth. An asteroid called 2013 TX68 will pass the Earth on March 8, 2016. It is estimated to be 100 feet in diameter.