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Is there an opposite world?

Is there an opposite world?
Halima Khanom from West Midlands (age 5-14)

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One Response

  1. Maybe, if the universe is infinite in either space or time.

    If there is an infinite amount of space for things to exist in, there must be an infinite amount of things within that space; including worlds that are exactly like this one except that traffic lights are blue, worlds that are just like Earth but spin the other way, and worlds that have every variation you can think of. So that would mean there is a world which is the opposite of ours.

    If there is an infinite amount of time for things to happen in, even the really unlikely things – the million-to-one chances – must happen, because there are so many opportunities for them to happen. For instance, if you played the lottery 17 million times, it wouldn’t be surprising if you won.

    And although it’s really, really unlikely, there is a tiny chance of anything happening, because of the way the universe works at a quantum level. (Quantum just means ‘when you get so small that things only come in little blocks, like lego bricks or pixels’). So, since there’s a chance that a opposite world could appear, if the universe is infinite in time, it will.

    How do you tell if the universe is infinite in space or time? We can’t prove it is. But we ought to be able to tell if it isn’t. However, we don’t know yet. I’ll keep you posted.

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