
The Four-Dimensional Trap
Time travel is science fiction's favourite wish-fulfilment toy. But once you account for the cosmic movement of the Earth and the messy physics of matter displacement, the fantasy quickly turns into orbital suicide.
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Time travel is science fiction's favourite wish-fulfilment toy. But once you account for the cosmic movement of the Earth and the messy physics of matter displacement, the fantasy quickly turns into orbital suicide.

On 2 September 44 BC, Cleopatra VII declared her three-year-old son Caesarion co-ruler of Egypt. It was a masterclass in dynastic survival after centuries of Ptolemaic fratricide - and the very move that sealed the boy's death.