David Braun reports in the National Geographic News that scientists have identified a thousand-yard-wide asteroid that may be heading for a collision with Earth 878 years from now.
Using radar and optical measurements made over the past 51 years, researchers have calculated that there is up to a one-in-300 possibility that Asteroid 1950 DA will slam into the Earth on March 16, 2880. ?We calculated the probability of collision based on what we know about the physical aspects of the asteroid and many other factors,? says Jon Giorgini of NASA?s Jet Propulsion Laboratory at the California Institute of Technology in Pasadena. ?As we get more information we will be able to adjust the level of probability up or down.?