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A Sound of Thunder

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A Sound of Thunder is a science fiction short story by Ray Bradbury, first published in R is for Rocket. It was later reprinted in Planet Stories, a pulp magazine, in January, 1954 .

It can now be read in several anthologies, including The Stories of Ray Bradbury (1980) and A Sound of Thunder (1987). Locus Index lists it as the first of the top ten most republished science fiction stories

This well-known story about time travel revolves around a business called Time Safari, Inc. Time Safari promises to take people back in time so they can hunt prehistoric animals, such as Tyrannosaurus Rex.

In order to avoid a time paradox, they are very careful to leave history undisturbed on the principle that even the slightest change can cause major changes in the future. Travelers are only allowed shoot animals which are already about to die, and they are required to stay on a path which hovers above the ground. Hunting trophies are not taken; your only souvenir can be a photograph of yourself standing next to the dead monster.

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In the story a man leaves the floating path and tramples a butterfly. Upon returning to the present, everyone finds the world to be a somewhat different from than the one they left. All of history has been changed slightly by the death of a single butterfly in the distant past.

This is an fictional exploration of how the Butterfly Effect (or "sensitive dependence upon initial conditions", in the words of Edward Lorenz) could affect time travel. However, this story pre-dates the work of Edward Lorenz by nearly 10 years, long before the term was coined and the principles understood by the scientific community.

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