NASA says a defunct seven-ton satellite is due to re-enter the atmosphere — with the potential to rain debris upon Earth. The Upper Atmosphere Research Satellite, or UARS, is expected to come down in late September or early October, the space agency said today in an advisory. "Although the spececraft will break into pieces during re-entry, not all of it will burn up in the atmosphere," NASA said. The agency said it's too early to say exactly when UARS will make its final plunge, or exactly where any debris will come down. Russian news reports suggested that Moscow was "in...