NASA managers have approved a $279-million mission to blast a hole in the comet Tempel 1 and study the resulting debris
NASA managers have approved a $279-million mission to blast a hole in the comet Tempel 1 and study the resulting debris, including pristine material from the comet's interior. Dubbed ``Deep Impact,'' the project will send a 770-lb. projectile hurtling into the comet at some 22,300 mph. A sister...
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