MSNBC/APCAPE CANAVERAL, Fla. - A NASA spacecraft with a Hollywood name Deep Impact blasted off Wednesday on a mission to smash a hole in a comet and give scientists a glimpse of the frozen primordial ingredients of the solar system.
With a launch window only one second long, Deep Impact rocketed away at the designated moment on a six-month, 268-million-mile (429 million-kilometer) journey to Comet Tempel 1. It will be a one-way trip that NASA hopes will reach a cataclysmic end on the Fourth of July.
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In July, the mission plan calls for a mother ship the size of an SUV is to release a copper-sheathed, TV-sized impactor right into the path of the comet. Scientists are counting on the impactor to blast a crater in Comet Tempel 1 that could swallow the Roman Colosseum.
It would be humans first look into the heart of a comet, a celestial snowball still containing the original building blocks of the sun and the planets.
Because of the relative speed of the two objects at the moment of impact 23,000 mph (36,800 kilometers per hour) no explosives are needed for the job. The force of the smashup will be equivalent to 4.5 tons of TNT, creating a flash that just might be visible in the dark sky by the naked eye in one spectacular Fourth of July fireworks display.
Nothing like this has ever been attempted before.
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The comet will be more than 80 million miles (128 million kilometers) from Earth when the collision takes place on the sunlit side of the comet, NASA hopes, in order to ensure good viewing by spacecraft cameras and observatories. The resulting crater is expected to be two to 14 stories deep, and perhaps 300 feet (90 meters) in diameter.
Can't wait.