On target: time sequence of a glass projectile striking a dust target. (Courtesy: Hiroaki Katsuragi and Jürgen Blum/Phys. Rev. Lett.) By dropping tiny projectiles into clumps of dust, physicists in ...
NASA is gearing up for a head-on collision with a comet. In January, the space agency will launch Deep Impact, a rocket that will fire a projectile into Comet Tempel 1. If all goes well, a collision ...
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