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Guided tour 3 · 7 stops · about 20 minutes

⏳ Is time travel possible?

If you'd like the question everyone asks first: into the future, into the past — what the physics actually allows.

  1. Can you travel into the future?Yes — every moving clock does it. By how much?Clock Lab →
  2. How far into the future could you go?The galaxy's centre and back — how much older is Earth?The 1 g voyage →
  3. Why can't you just come back?Light cones, and a twin who turns round.Spacetime →
  4. Could a black hole be a shortcut?Space flowing in faster than light can swim out.The River →
  5. Can you cross a wormhole?Einstein and Rosen's bridge between two universes.Wormholes →
  6. Could you loop back into your own past?A spinning universe where light cones tip over.Time loops →
  7. So — is time travel possible?Forward, backward, paradoxes — the verdict.Concept →

Each stop asks you to predict before you explore, so the answers aren't listed here.

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