Is multiverse theory true or false?

Nothing denies the existence of other universes. So if the universe is the bubble, which origin is in the Big Bang, nothing denies that there was not another Big Bang somewhere else. And before we can confirm or deny the existence of another universe, we must go outside the universe, that we could see those things. 

If those other universes exist they are similar universes with our universe. And there could also be intelligent lifeforms. But those universes can form antimatter. 

The thing is that the other universes are sometimes introduced as the source of outcoming gravity effect what expands the universe. There was also some evidence that there were other universes before our universe. That evidence is gotten by measuring Hawking's radiation that comes out from the black holes. 

And before we deny anything, what includes the universe or cosmos. We might want to take "little brief about the things, "what is certainly impossible". 

At the first, we might remember, that people believed that Earth was round, but it was the center of the universe. People believed that the Earth was the only planet in the universe. Until astronomers confirm that also Jupiter and other planets existed. 

Then people thought that the only galaxy in the universe was the Milky Way, and the other galaxies were orbiting it. Then scientists realized that there are also other spiral galaxies, and many of them are far bigger than Milky Way. And after that started the discussion about the existence of other solar systems. 

At first, many people said, that there are no other solar systems until astronomers found the first brown dwarfs. Tho of brown dwarfs The Luhman 16 system was found at 6,4 light-years from Earth.

And soon after that found the first gas planets, and now scientists know also rocky planets, which are about two times bigger than Earth. Then the claim was that there were no other multiplanet solar systems than our solar system. 

()https://astronomy.com/news/2020/12/is-the-multiverse-theory-science-fiction-or-science-fact?utm_source=asyfb&utm_medium=social&utm_campaign=asyfb

()https://www.iflscience.com/space/dead-black-holes-may-suggest-this-is-not-the-first-universe/

()https://www.newsweek.com/what-multiverse-parallel-universes-could-be-hospitable-life-scientists-say-924146

()https://www.rankred.com/whats-outside-the-universe/

()https://www.strangerdimensions.com/2020/10/14/sir-roger-penrose-comments-on-the-universes-before-our-own/

()()https://en.wikipedia.org/wiki/Luhman_16

()()https://www.rankred.com/whats-outside-the-universe/

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Planets of Gliese system

The missing exoplanet Gliese 581 g

And then astronomers found the first multiplanet solar system orbiting the dwarf star Gliese 581. The fact is that there is a small mystery in the Gliese 581 system. There seems missing the planet Gliese 581 g, which could be in the habitable zone. The other planets except for the most out planet Gliese 581 f and Gliese 581 g are not confirmed.  In some sources, the Gliese 581 d is also unconfirmed, but there are contradictions in sources. 

The thing that makes this thing mystery is that the Gliese 581 g should be between the Gliese 581 c and Gliese 581 d. If all planets are found by using calculated trajectories, there should be the planet between the trajectories of Gliese 581 c and Gliese 581 d. 

()https://en.wikipedia.org/wiki/Gliese_581

()https://en.wikipedia.org/wiki/Gliese_581d

In the Finnish Wikipedia, the Gliese 581 is listed as confirmed.

()https://fi.wikipedia.org/wiki/Gliese_581

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Exoplanet Proxima Centauri B surface.  The photorealistic image painted in the 1970s by David Hardy and shows an impressive prediction of that thing. At that time the exoplanets were only theories. (Pinterest)

Exoplanet Proxima Centauri B 

Also, when scientists found the exoplanet Proxima Centauri B in 2016, that thing confirmed that there are many unknown things in the universe. The distance to that planet is only 4,2 light-years. And that caused the question. Why has that planet that is located in a habitable zone of the nearest star of our solar system has not found earlier?

The next thing is was caused the discussion was the black holes. Certainly, they do not exist. And quite soon the first black holes are confirmed because they are sending X- and gamma-rays. 

So that thing is one of the things on the long list about things "that certainly does not exist". That list is long and very sad because sometimes telling against the authorities has caused that scientist executed. But that list is also a good example that nothing is so sure than unsure. 

()https://en.wikipedia.org/wiki/Proxima_Centauri_b