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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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staged rocket

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staged rocket, vehicle driven by several rocket systems mounted in vertical sequence. The lowest, or first stage, ignites and then lifts the vehicle at increasing velocity until exhaustion of its propellants. At that point the first stage drops off, lightening the vehicle, and the second stage ignites and accelerates the vehicle further. Most space launch vehicles have three stages. See also launch vehicle.