The moment when a rocket or spacecraft launches and leaves the ground, or the launch event itself.
From 'blast' (explosion/thrust) + 'off' (away). Emerged in the 1950s during the space race as rockets were first developed to lift spacecraft from Earth.
Engineers coined 'blastoff' to match the dramatic reality—it really is a controlled explosion pushing a vehicle skyward at tremendous force, making the term perfectly literal.
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