There are presently 1322 potentially hazardous asteroids that can come closer to Earth than 0.05 AU. Potentially Hazardous Asteroids (PHAs) are pieces of space rock generally larger than approximately 100m in diameter. None of the known PHAs is on a collision course with the Earth, although astronomers are finding new ones all the time.
Showing posts with label collision course. Show all posts
Showing posts with label collision course. Show all posts
Friday, 20 July 2012
Subscribe to:
Posts (Atom)