Before a Space Shuttle liftoff, showers of sparks are seen flying around under the Space Shuttle's three main RS-25 engines (SSME's). What are those sparklers for and do they ignite the engines?
The sparks are emitted by pyrotechnic devices called technically Radial Outward Firing Igniters (ROFIs) and colloquially "sparklers".
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What were the sparks under the Space Shuttle before launch?
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