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What is one major physical hurdle that has been cleared for the prospect of time travel according to the text?
What is one major physical hurdle that has been cleared for the prospect of time travel according to the text?
Who theorized the grandfather paradox according to the passage?
Who theorized the grandfather paradox according to the passage?
Why does the text suggest that traveling back in time could pose more challenges than just overtaking the speed of light?
Why does the text suggest that traveling back in time could pose more challenges than just overtaking the speed of light?
According to Peter Galison, what has happened to Einstein's relativity theory?
According to Peter Galison, what has happened to Einstein's relativity theory?
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What is one obstacle posed by the grandfather paradox?
What is one obstacle posed by the grandfather paradox?
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What did René Barjavel speculate could happen if a time traveler were to kill their own grandfather?
What did René Barjavel speculate could happen if a time traveler were to kill their own grandfather?
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According to Novikov's self-consistency principle, what would be the outcome of time travelers affecting historical events?
According to Novikov's self-consistency principle, what would be the outcome of time travelers affecting historical events?
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What distinguishes the many-worlds interpretation of time travel from Novikov's self-consistency principle?
What distinguishes the many-worlds interpretation of time travel from Novikov's self-consistency principle?
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Why would it be impossible to alter historical records by averting the sinking of the Titanic according to the text?
Why would it be impossible to alter historical records by averting the sinking of the Titanic according to the text?
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How does the concept of parallel universes connect to time travel, based on the text?
How does the concept of parallel universes connect to time travel, based on the text?
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What is the main concept behind Novikov's self-consistency principle in relation to time travel?
What is the main concept behind Novikov's self-consistency principle in relation to time travel?
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How does the final hypothesis mentioned in the text efficiently address the grandfather paradox?
How does the final hypothesis mentioned in the text efficiently address the grandfather paradox?
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What would happen if a person altered their ancestry in ways that obstructed their own birth?
What would happen if a person altered their ancestry in ways that obstructed their own birth?
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What does Stephen Hawking believe would enable humans to travel millions of years into the future?
What does Stephen Hawking believe would enable humans to travel millions of years into the future?
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Why does Hawking mention that bygone eras are off limits for time travel?
Why does Hawking mention that bygone eras are off limits for time travel?
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Why does Hawking admit that he used to avoid talking about time travel?
Why does Hawking admit that he used to avoid talking about time travel?
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What is one reason suggested in the text as to why humans could repopulate Earth in the future?
What is one reason suggested in the text as to why humans could repopulate Earth in the future?
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What does Hawking's optimism about discussing time travel suggest?
What does Hawking's optimism about discussing time travel suggest?
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