What If The Universe DID NOT Emerge From The Big Bang?
PBS Space Time

What If The Universe DID NOT Emerge From The Big Bang?

B1IntermediateNovember 13, 202623 min
  • One speaker
  • Science

👉 Head to https://brilliant.org/spacetime/ for a 30-day free trial + 20% off your annual subscription Check out the Space Time Merch Store https://www.pbsspacetime.com/shop Here’s the story we like to tell about the beginning of the universe. Space is expanding evenly everywhere, but if you rewind that expansion you find that all of space was once compacted in an infinitesimal point of infinite density—the singularity at the beginning of time. The expansion of the universe from this point is called the Big Bang. We like to tell this story because it's the correct conclusion from the des...

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But since then we've learned so much more.

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Thank you to Brilliant for supporting PBS. universe that followed Einstein's general theory of relativity back in the 19-teens. But since then we've learned so much more. Does our modern understanding of the universe still insist on a point like Big Bang?

0:45

Recent work actually gives us a way to avoid the beginning of time. The key to understanding whether the universe had a beginning is to decide whether their There exists what we call a past singularity, whether all points in space were at the same point at time t equals zero.

1:08

And from the earliest models of the expanding universe, the answer seemed yes. When people like Alexander Friedman and George Lemartre solved the equations of Einstein's general relativity back in the 19-teens and 20s, they found that if you rewind the expansion, Then indeed, all points converged on one point at the start of time.

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