Exploring the concept of living in parallel universes lying beyond our current life is intriguing. Using our current astronomy knowledge, we can delve into the notion of a multiverse through the astrophysical lens.
It is essential to have a clear understanding that the Universe is non-static but constantly expanding.
In 1929, the Astronomer Edwin Hubble observed:
"Galaxies that are farther away from us tend to recede at a faster rate.—a discovery that helped pave the way toward our current notion of the Universe, starting with the big bang and expanding ever since." https://www.nationalgeographic.com/science/article/the-universe-is-expanding-faster-than-it-should-be
Then, In 1998, Saul Perlmutter's research on cosmology found out that the farthest supernovas observed seemed less bright than anticipated. Saul's strategy relied on "standard candles" - supernovas that produce the same energy and have equal luminosity.
This approach helps us determine their distance from our position. To view the experiment, please visit this website: https://www.slac.stanford.edu/econf/C990809/docs/perlmutter.pdf.
Supernovas, which are massive explosions during the final stages of a star's life, are truly awe-inspiring events in the Universe. They play a crucial role in reinforcing the concept of an accelerating universe.
Now, we can introduce the enigmatic constant responsible for the Universe's acceleration: Dark energy. Despite its prevalence, we don't know how it works. It accounts for 68% of the total mass-energy in the Universe, with 27% attributed to Dark matter and approximately 5% to visible matter.
The Universe apply physical laws here and anywhere in the cosmos.
The most famous is the speed of light, approximately 299.792 Km/s. It's the ultimate limit; no matter how fast you go, you can't surpass a beam of light.
To sum up, observing the light emitted from stars with a recessional velocity equal to or greater than the speed of light seems impossible. It supports the theory that self-contained universes may exist beyond our visual perception.
These universes operate independently, with their physical laws, and as different bubbles in the vast cosmos; who knows?
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