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Moment of truth
The Voyager I spacecraft is the most distant man-made object in the universe. It was launched in 1977 and as in 2002, it was more than 8 billions miles from the Earth.


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ignition temperature Chem., Eng.
The temperature to which a substance must be heated before it will burn in air spontaneously independent of the source of heat. For example, the ignition temperature of ethanol is 425°C.

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