At the end of the story the sound of thunder is the whole impact of the differences that have influenced the world and society because of the tragic mistake Eckles did, of killing the butterfly. So then Travis kills Eckles because of his big mistake, that seemed to be all his fault. The sound at the end comes from the shot.
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At the end of the story Eckels die.
A sound of thunder can refer to both the booming noise of the dinosaur and the shot that Travis fires that kills Eckels at the end of the story. As an expression, 'the sound of thunder', as described in the essay linked below, written or spoken is used to illustrate the power of something coming as the sound of thunder foretells a coming storm.
the year the story takes place is 2055
science fiction / time travel
it could reach up and grab the moon.