A beautiful pinwheel in space might one day blast Earth with death rays, scientists now report. Unlike the moon-sized Death Star from Star Wars, which has to get close to a planet to blast it, this blazing spiral has the potential to burn worlds from thousands of light-years away.
The fact that a relatively small asteroid could still cause such a massive explosion as Tunguska suggests "we should be making more efforts at detecting the smaller ones than we have till now," according to astronomers.
If terrorists ever unleashed a biological weapon, unusual molecules normally found in the blood of llamas could quickly help warn of the attack, scientists now report.
Nanotechnology could soon enable a new generation of chemical and biological weapons that could escape current arms inspection schemes, according to experts.