How Do You Know Which Directoin to Look Big Bang Space
Tin can Nosotros Discover Out Where The Big Bang Started?
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Is in that location a reason why nosotros can't extrapolate the expansion of the universe backwards to determine where it all started in the Big Bang? Thanks!
A representation of the evolution of the universe over thirteen.77 billion years. The far left depicts the... [+]
Nope - nosotros can, in fact, trace the universe back to where it all started. Unfortunately, information technology rapidly gets complicated, considering the respond is that information technology began where yous are sitting. And also where I am sitting. And also where everyone else on the planet is sitting. And also at the center of our milky way, and at the middle of every other galaxy.
The idea here is that our electric current universe is expanding, so the universe must have been smaller in the past. Then if y'all take every point in space that exists now, and trace it backwards, all those points go closer and closer together until they reach a mathematical and physical stopping indicate - a singularity. A singularity is an infinitesimally small point, which can contain quite a large corporeality of matter or free energy - the centers of black holes are also singularities.
The singularity nosotros reach if we trace back the whole universe must have independent all the energy that now exists in our universe, as either mass or light, or dark affair, or dark free energy. Merely it also contained all the space - so all the points of space that nosotros now see as very widely separated were nowadays within that singularity. So the "where" of the Big Bang is, quite literally, everywhere.
We have quite a lot of evidence pointing us to this idea of a very tiny universe at the very get-go of our universe; i of the more important being the detection of the catholic microwave background (or CMB for short). This background radiation is chosen "background" considering our universe has a central glow in the microwave that y'all tin't escape - any other observations yous're making at this wavelength will be in improver to the CMB.
Critically, the CMB is very precisely near the exact same in every direction that we expect, and even though this glow is the oldest light in the universe, and the universe was much, much smaller than it is now, you would still not expect it to exist the exact same everywhere — unless the universe had been fifty-fifty smaller previously. The theory of the Big Bang produces this naturally, because in betwixt all space being compressed into the singularity, and the product of the low-cal we encounter every bit the CMB, in that location is predicted to be a period of super fast expansion — inflation. Or, if yous're tracing the universe backwards in time, the universe shrinks dramatically downwardly.
The thing to keep in heed with the Big Bang and the expansion of the universe is that information technology wasn't an "explosion" similar a detonation here on earth, with a definite centre, and the universe spooling outwards into a pre-existing space. The closest y'all tin become while thinking of conventional explosions would be if you managed to actually effectively explode a tiny object, and then asked "Where was this piece when the explosion happened?" It was at the center, with all the other scattered pieces. For our universe's expansion, each of those pieces would have to exist markers in space itself. Where did the universe's big bang happen? It happened where the universe was small, and each fragment of our current universe was there to witness it.
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Source: https://www.forbes.com/sites/jillianscudder/2016/03/30/astroquizzical-where-big-bang/
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