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PoppersOfCorn t1_j8vylsh wrote

What about it expanding everywhere at once? and we are limited by light speed so we can onky see X amount. So to us we are the centre but that doesn't mean there needs to be a centre

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Negative-Fan8460 OP t1_j8vz8rt wrote

No, let's take inflating a balloon for an example.you blow air to it and it expands (take that as big bang) now that it expanded it's hollow inside(there's only air in it) now mark 2 points on opposite sides of the balloon. Imagine that our Galaxy is at one point and at the point onopposite side is another Galaxy. We might be looking at that galaxy and then observe that there's lot of empty space in the middle( middle of balloon filled with air). But we don't see anything like that so big bang is fake?

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dulce_3t_decorum_3st t1_j8vzo8i wrote

But the Big Bang didn’t happen in the same way as an inflating balloon. Your premise is false. The expansion happened everywhere. That is, each measurable point in space grew (and continues to grow) further from all other points in space. This is called inflation and expansion.

Edit: I should add that for this reason, every point is the centre of the universe relative to all other points. If you were able to teleport to the edge of our observable universe, you’d be at the centre of a similarly-sized observable universe “bubble.”

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woodlark14 t1_j8w0v0z wrote

In your analogy, and I can't stress that it is an analogy enough, the surface of the balloon is representing 3d space. We don't see the interior of the balloon because it's not the universe it's the shape that the universe is curved around.

What we actually observe is that distances on a cosmic scale are all getting longer at a range proportional to their length. This is distinct in some ways from observing objects moving away from us, specifically it isn't restricted by the speed of light as the objects don't really have the velocity that the changing distance to them implies.

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halffullofthoughts t1_j8w0i0y wrote

Or the balloon is so humongous that we only see a tiny fragment of it that just feels flat, hard to tell with the data we're given

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