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The Duel of the Klingon Battle Cruisers - Solution
- K
- In the Cruiser 1 frame, Q is simultaneous with K
which comes before P. So Cruiser 1 fires its cannon first, and
Cruiser 2 second.
- A
- When Cruiser 2 is hit at Q, the damage can only propagate
forward at or slower than the speed of light. Therefore, the nose of
Cruiser 2 will not feel the damage until A, giving it plenty
of time to fire its cannon back at P.
(In technical terms, the spacetime points P and Q are
space-like separated so they cannot be causally connected.)
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