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返回 【妙招大看台】如何理解“穿越”？

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Are you weirded out by wormholes? Flummoxed by your flux capacitor? Strap yourself in for this time-travel primer.
You will need: a basic knowledge of the theory of relativity and an open mind.
Optional: a PhD in Physics.
Time-travel theories are riddled with paradoxes that may make your brain explode.
Step 1:
Brush up on your Einstein: His special theory of relativity revolutionized physics by suggesting that traveling into the future is possible. __________ So if you're in a spaceship going very close to the speed of light for five years, you could return home to find that it's 50 years later on Earth.
Even on a normal transatlantic flight, time slows down with speed. In one experiment using two atomic clocks, the clock sent into space fell 40 nanoseconds behind the one left on the ground.
Step 2:
Going back in time is a far trickier proposition – but might be possible if you could travel faster than the speed of light. __________ Upon returning home, you’d find yourself back in time. The only problem is that traveling that fast is scientifically impossible – at least for now.
Step 3:
Make the quantum leap. __________ But unless you’re a subatomic particle, you’re out of luck.
Step 4:
___（这里有一个连字符哦）___ If you were to tow one end of a wormhole into space close to the speed of light, then return that end to Earth, you would theoretically be able to enter the wormhole today and come out of the other end in yesterday.
Be skeptical. Wormholes are so tiny and close so rapidly that it would take a great leap of science to be able to harness them for time travel.
Step 5:
__________ The so-called Grandfather Paradox – going back in time and killing your grandfather, thus preventing your own birth and making it impossible for you to travel back in the first place – has been used to help illustrate why backward time travel is impossible.
Step 6:
Understand what's done is done. Most ideas about backward time travel include the “chronology protection conjecture,” meaning that nature would prevent you from changing the past. __________ It also means that all the embarrassing moments you'd love to erase are going to happen all over again.
Step 7:
Open your mind to the “many-worlds” interpretation. Some theorists have gotten around the rigid “whatever happened, happened” idea by claiming that every different action you take in the past splits off into a parallel universe. __________
Did you know? Theoretical physicist Stephen Hawking once said, “Time travel might be possible, but if that is the case why haven’t we been overrun by tourists from the future?”
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