Paradoxes in Time Travel Theories
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Questions and Answers

What is one major physical hurdle that has been cleared for the prospect of time travel according to the text?

  • The speed of light (correct)
  • The existence of parallel universes
  • Quantum entanglement
  • The bending of space-time

    • Who theorized the grandfather paradox according to the passage?

  • Isaac Newton
  • Peter Galison
  • Albert Einstein
  • René Barjavel (correct)

    • Why does the text suggest that traveling back in time could pose more challenges than just overtaking the speed of light?

  • Because the earth's crust would be affected
  • Because time machines do not exist
  • Because a paradox like the grandfather paradox could occur (correct)
  • Because the laws of physics prevent time travel

    • According to Peter Galison, what has happened to Einstein's relativity theory?

    <p>It has been pushed harder than any theory in history</p> Signup and view all the answers

    What is one obstacle posed by the grandfather paradox?

    <p>Creating a time loop</p> Signup and view all the answers

    What did René Barjavel speculate could happen if a time traveler were to kill their own grandfather?

    <p>The time traveler would cease to exist</p> Signup and view all the answers

    According to Novikov's self-consistency principle, what would be the outcome of time travelers affecting historical events?

    <p>Travelers could prevent paradoxes by avoiding inconsistencies.</p> Signup and view all the answers

    What distinguishes the many-worlds interpretation of time travel from Novikov's self-consistency principle?

    <p>The many-worlds theory posits the existence of alternative pathways.</p> Signup and view all the answers

    Why would it be impossible to alter historical records by averting the sinking of the Titanic according to the text?

    <p>The historical outcome would remain consistent.</p> Signup and view all the answers

    How does the concept of parallel universes connect to time travel, based on the text?

    <p>Parallel universes offer alternative pathways for every possible occurrence.</p> Signup and view all the answers

    What is the main concept behind Novikov's self-consistency principle in relation to time travel?

    <p>Ensuring that events causing paradoxes are avoided.</p> Signup and view all the answers

    How does the final hypothesis mentioned in the text efficiently address the grandfather paradox?

    <p>By rerouting itself around the grandfather paradox.</p> Signup and view all the answers

    What would happen if a person altered their ancestry in ways that obstructed their own birth?

    <p>They would still exist in person but their historical identity would be gone.</p> Signup and view all the answers

    What does Stephen Hawking believe would enable humans to travel millions of years into the future?

    <p>Spaceships exceeding the speed of light.</p> Signup and view all the answers

    Why does Hawking mention that bygone eras are off limits for time travel?

    <p>It violates the rule that cause comes before effect.</p> Signup and view all the answers

    Why does Hawking admit that he used to avoid talking about time travel?

    <p>For fear of being labeled as a crank.</p> Signup and view all the answers

    What is one reason suggested in the text as to why humans could repopulate Earth in the future?

    <p>By traveling millions of years into the future through exceeding the speed of light.</p> Signup and view all the answers

    What does Hawking's optimism about discussing time travel suggest?

    <p>'These days I'm not so cautious.'</p> Signup and view all the answers

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