What Science Says About... Time Travel: The Evidence-First Guide to the Unexplained (What Science Says About... The Nature of Reality - Volume 2) - Softcover

Inhaltsangabe

Einstein's own equations don't forbid time travel — and that fact has unsettled physicists for nearly a century.

Time travel sounds like the exclusive property of fiction: levers, control panels, a flash of light between one year and the next. But inside the mathematics of general relativity sits something stranger and far more serious — solutions where forward motion can loop back on itself, and no rule of physics steps in to stop it. This book takes that mathematical permission seriously, tracing it from a forgotten 1937 paper through Gödel's unsettling discovery, wormhole theory, and the modern debates still dividing physicists today.

What research actually reveals is a split verdict. Time dilation — one observer's clock genuinely running slower than another's — isn't speculation at all; it's measured fact, confirmed in atomic clocks, satellites, and astronauts who've returned home younger than the planet they left. Backward time travel is a different story: mathematically permitted, physically unconfirmed, and bound up with unresolved questions about quantum gravity that no experiment can currently settle.

For any reader who has ever wondered whether science fiction borrowed from real physics or invented it wholesale, this book draws the line precisely — and shows why that line keeps shifting.

Inside, you'll discover:
– Why GPS satellites are engineered around relativistic time dilation, or your phone's map fails within hours
– How Kurt Gödel handed Einstein a birthday gift that unsettled him for the rest of his life
– What the grandfather paradox actually proves, and what popular culture gets wrong about it
– Why exotic matter, not fictional physics, is the real obstacle to a traversable wormhole
– Where working physicists genuinely disagree — and why more research won't resolve it

What Science Says About... is a series devoted to following serious questions wherever the evidence leads, without inflating speculation into certainty. Explore the series to see which other fascinating questions get the same rigorous treatment.

Read on to find out exactly where the physics ends and the fiction begins.

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