It is estimated that four billion meteoroids fall to earth everyday. Though they enter the Earth's atmosphere at as much as 130,000 miles per hour, most of them are too tiny to do any noticeable harm. In 2004, a 30-foot-wide meteoroid struck the atmosphere over Antarctica. If left two million pounds of dust in its wake affecting the climate on the other side of the planet. After it impacts the Earth, a meteoroid is referred to as a meteoroid.