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The Challenger exploded because the external tank exploded.

The ET exploded when a couple of 'o' rings failed in the solid rocket booster (SRB.)

That failure caused hot gases to escape and actually burn a hole in the lower portion of the ET and the coupling holding the SRB in place. When the coupling gave way the SRB swung out and punctured the upper portion of the ET. When that happened, the fuel in the upper portion, met the fuel in the lower portion and there was an explosion that blew the Challenger into pieces.

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