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stage zero


'stage zero' can also refer to...

 

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A term describing the beginning of the first stage of the propulsion process of a rocket or launcher. T-0 is often used in countdowns to indicate the moment of lift-off. Some rockets take off at engine ignition, as in the case of hypergolic propellants which ignite spontaneously on contact, while some lift off a few seconds after engine ignition, allowing the engine to build up to full thrust; in each case this is termed T-0. However, T-0 is also sometimes and confusingly used to mark the point of engine ignition, and actual lift-off may therefore occur at T + a number of seconds.

Subjects: Astronomy and Astrophysics.


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