What are NEOs?
Near-Earth Objets (NEOs) are asteroids or comets orbit of which may represent a hazard to the Earth. Such objects might one day hit Earth in the same way that some already hit, bringing e.g. to the extinction of the dinosaurs 65 million years ago, or on a lesser scale, to the Tunguska event, at the beginning of the 20th century, when 1200 square miles forest were destroyed in Siberia, Russia. Research program are underway to catalog all such hazardous objects.
