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  • What if there are other universes,

  • just like ours?

  • With an infinite number of Earths?

  • With uncountable versions of you?

  • What if we don't have to look too far

  • to find them?

  • Maybe a mirror version of our reality

  • Our Universe began

  • when a small, but very hot singularity

  • exploded in the Big Bang

  • 13.7 billion years ago.

  • But maybe it wasn't the only one to be born then.

  • In physics, space and time

  • fuse into one four-dimensional continuum,

  • If this space-time is flat

  • and stretches far beyond the limits of our observation,

  • there is a possibility that it holds

  • uncountable disconnected universes.

  • But for all we know,

  • there are a limited number of ways

  • the particles in those other universes can be put together.

  • At some point the realities

  • will have to start repeating themselves.

  • That means, in theory,

  • our reality is only a small part of what's out there,

  • and someone just like you

  • might be living in a parallel universe

  • similar to our own.

  • And that universe may be as close

  • as a million trillion trillionth of a centimeter away.

  • Although the wall between the universes

  • might be incredibly small,

  • traveling between them won't be easy.

  • But it could be done.

  • All you'd need is an 85-megawatt nuclear reactor

  • capable of firing billions of neutrons on command.

  • That's how a team of physicists,

  • working in Tennessee's Oak Ridge Laboratory,

  • are trying to open the gates

  • of a mirror universe.

  • Of course, they have to find it first.

  • It all comes from a theory that says,

  • if you beam neutrons at a wall,

  • none should pass through.

  • If some do manage to make it to the other side,

  • it would mean that they've transformed

  • into mirror images of themselves

  • as they went through the wall between the two worlds.

  • There is one odd thing about neutrons.

  • In particle beams, on average,

  • they last for 14 minutes and 48 seconds

  • before they decay into protons.

  • But if you place neutrons in a lab bottle,

  • they'll break down 10 seconds faster.

  • It's not something we can explain with physics yet.

  • Neutrons are all the same,

  • and there shouldn't be any

  • 10-second difference in their lifespan,

  • regardless of where they are stored.

  • Could it be possible

  • that the neutron experiments didn't go as expected

  • because physicists accidentally opened

  • a portal to a mirror world?

  • That would be the first evidence

  • that a mirror universe exists right next to our own.

  • A mirror world with mirror atoms,

  • maybe even a mirror Earth.

  • An entire mirror world

  • almost totally cut off from ours.

  • Could you meet another version of yourself

  • in that mirror world?

  • Now it gets a little complicated.

  • Even though particle configurations can repeat themselves,

  • the odds of finding a portal to a parallel universe

  • that's exactly the same as ours

  • are close to zero.

  • Think about it.

  • There are a novemvigintillion particles in the Universe.

  • That's the number 1 followed by 90 zeros.

  • Every single one of them

  • would need to have had the same interactions

  • for 13.7 billion years to create

  • an identical universe to what we have now.

  • The mirror universe would most likely have

  • its own mirror laws of physics.

  • But it's hard to know for sure,

  • because nobody's detected a single mirror particle yet.

  • Maybe, we shouldn't be searching for answers in a lab.

  • Perhaps we should be looking in space itself.

  • Our Universe is full of dark matter.

  • We can't observe it directly,

  • and we have no idea what it's made of

  • or how it works, but...

  • we know that dark matter is strong enough

  • to stop galaxies from flying apart.

  • Yet, we can't find it.

  • Perhaps the reason is that dark matter

  • is leaking from a mirror world into ours.

  • If we could detect that,

  • it would confirm that a mirror universe exists.

  • Because we know that there is five times more dark matter

  • than there is visible matter in the Universe,

  • you've gotta think that a mirror universe

  • is much more massive than the one we live in.

  • Even if we did manage to open up a gate into another world,

  • the portal would be incredibly small

  • too small for you to see anything

  • without some very powerful lab equipment.

  • We'd still be dealing with neutrons and protons, remember?

  • You could only enter that realm

  • if you had the ability to shrink yourself

  • to the size of an atom.

  • But that's a story for another WHAT IF.

What if there are other universes,

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もしパラレルワールドへの扉を開くことができたら? (What If We Could Open a Portal to a Parallel Universe?)

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    林宜悉 に公開 2021 年 01 月 14 日
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