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  • This pretzel-shaped collection of galaxies

  • is our Universe.

  • And it's about to collide with another universe.

  • It might be fascinating to watch, but

  • we should probably be worried about

  • what's going to happen when they crash.

  • The only potential evidence

  • of a universal collision

  • that we've ever discovered

  • is in the form of a "cold spot" in our Universe.

  • In 2013, the European Space Agency's

  • Planck satellite confirmed that this area

  • is 1.8 billion light-years across,

  • it's much colder than the rest of space,

  • and it seems to be missing 10,000 galaxies.

  • At first, scientists were baffled by its existence,

  • but now some have theorized

  • that this spot might be a kind of scar or bruise

  • left from colliding with another universe.

  • But how can we know for sure?

  • And if this is the case, how long before it happens again?

  • Before we go any further, let me take a second

  • to address something that might have some of you scratching your heads.

  • Usually, when we refer to the universe,

  • we're talking about all space and time,

  • including planets, stars, galaxies,

  • and all other forms of matter and energy.

  • So if the universe basically means everything in existence,

  • then logically there can only be one of them, right?

  • Not necessarily.

  • Some scientists believe in the concept of the multiverse.

  • This theory states that our Universe wasn't the only one

  • that popped into existence during the Big Bang,

  • that there is an infinite number of other universes out there too,

  • and we just haven't found a way to see or measure them yet.

  • If this theory is right, then it's possible that all these other universes

  • could've grown at the same rate, at the same time, after the Big Bang.

  • If that's the case, then they might have banged into each other as they expanded.

  • And that brings us back to the cold spot.

  • The cold spot is a region of our Universe that's 0.00015 °C

  • colder than everywhere else.

  • That might not seem like a big deal, but

  • when the rest of the Universe's temperature is so consistent,

  • scientists have started to think it's something more than an anomaly.

  • They think that the cold spot might be a scar left over from a collision between universes,

  • and the crash might have moved a bit of energy out of that spot in our Universe,

  • causing the colder temperature.

  • But what would a collision of that magnitude look like?

  • Well, we can't say for sure, but there are some pretty cool ideas out there.

  • According to one physicist at the University of California,

  • if another universe came crashing into ours,

  • it would look like a giant mirror in the sky rushing towards us,

  • because its wall would reflect light.

  • If this other universe collided with our own,

  • we could inherit a whole new set of governing laws of physics.

  • Gravity could weaken or disappear,

  • resulting in a slew of planets escaping the gravity of their stars,

  • sending them flying off into space at ridiculous speeds.

  • Without gravity, stars would cease to exist, and we'd be left in perpetual darkness.

  • This would make life on Earth, and throughout most of the universe, nearly impossible.

  • With no shining stars, we'd lose any means of nourishment or breathable air,

  • as plants would no longer be capable of transforming

  • starlight into energy through photosynthesis.

  • But as bad as that all sounds, it's not something we have to worry about,

  • since the chances of our universe colliding with another one

  • are slim to none.

  • For one thing, we're not even sure that there are other universes out there to collide with.

  • And even if there are,

  • any collisions would've happened at that point when they were expanding,

  • 380,000 years after the Big Bang,

  • which would mean there's little to no chance of it happening again.

  • If you're going to worry about colliding with anything,

  • maybe you should pick something a little more realistic,

  • like an asteroid.

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

This pretzel-shaped collection of galaxies

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私たちの宇宙が別のものと衝突したら? (What If Our Universe Collided With Another One?)

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    林宜悉 に公開 2021 年 01 月 14 日
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