But this stuff is orbiting. It is not just sitting there. Bernard Brauer <bbrauer777@xxxxxxxxx> wrote: http://discovermagazine.com/2001/dec/featshoot Still, the real hazards are in space. Although debris in lower orbits tends to fall and burn up in a few months or years, "once you get past 1,000 kilometers, lifetimes are on the order of a thousand years or more," Johnson says. Because so much of what is sent into space stays up there so long, and more is being added all the time, the density of debris in low-Earth orbit?where the shuttle and the space station fly?doubled between 1960 and 2000. --------------------------------- The all-new Yahoo! Mail goes wherever you go - free your email address from your Internet provider.