There have been two rocket explosions mentioned in the search results:
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On January 28, 1986, the Space Shuttle Challenger broke apart 73 seconds into its flight, killing all seven crew members aboard.
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On April 20, 2023, SpaceXs Starship rocket, the most powerful ever built, exploded before it reached space, ending the first major test.
Therefore, the question is ambiguous and needs clarification to determine which rocket explosion is being referred to.
