quotes
The 'potentially hazardous' designation simply means over many centuries and millennia the asteroid's orbit may evolve into one that has a chance of impacting Earth. We do not assess these long-term, many-century possibilities of impact,
Paul Chodas, manager of NASA's Center for Near-Earth Object Studies, previously told NewsweekA PHA is one that has an orbit intersecting the Earth's orbit around the sun by less than 0.05 astronomical units (1 AU is the distance to the Sun), that's just over 4.5 million miles,
Martin Barstow, a professor of astrophysics and space science at the University of Leicester in the U.K., previously told NewsweekMartin Barstow,
professor of astrophysics and space science