An Interesting Universe

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Wade Hampton III
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Re: An Interesting Universe

Post by Wade Hampton III » Thu Oct 24, 2019 11:41 pm

A VERY Old Star!

Bond and his collaborators estimated HD 140283's age to be 14.46 billion years — a significant reduction on the 16 billion previously claimed. That was, however, still more than the age of the universe itself, but the scientists posed a residual uncertainty of 800 million years, which Bond said made the star's age compatible with the age of the universe, even though it wasn't entirely perfect.

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https://www.space.com/how-can-a-star-be ... ket-newtab

The mystery of the age of HD 140283 is leading to something bigger and more scientifically complex, altering the understanding of how the universe works. "The most likely explanations for the paradox are some overlooked observational effect and/or something big missing from our understanding of the dynamics of the cosmic expansion," Matthews said. Precisely what that "something" is, is sure to keep astronomers challenged for some time.

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PhuBai68
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Re: An Interesting Universe

Post by PhuBai68 » Thu Oct 31, 2019 1:23 pm

Back when I lived in West Virginia many a clear night I'd go outside and look up at all those countless stars.
To think most are suns with their own group of planets orbiting them, there has to be other intelligent life out there.
There are too many unexplained mysteries on earth for there not to have had been some form of super intelligent help in the creation whether the pyramids or Roman structures.
Even the castles and churches that were built in ancient times, where did that knowledge come from?
I'm rambling, sorry.
It's not diversity, it's displacement.

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Wade Hampton III
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Re: An Interesting Universe

Post by Wade Hampton III » Tue Jun 02, 2020 10:01 pm

If we look through our telescopes, we also look back in time. We see how the universe got from a hot dense state to the present cold empty state. But there is a wall to what we can see: the Cosmic Microwave Background Radiation from around 380,000 years after the Big Bang. It’s sometimes called the “afterglow of the big bang”. Before that, the universe was filled with opaque plasma, so light can’t come from further back. It’s possible that we may detect gravity waves from earlier, but we’ve just started with that kind of observations. However, we’re not clueless: we have great and well-proven physics theories, we can do laboratory experiments, and we can see ripples and dots on the Cosmic Microwave Background Radiation that must have come from somewhere. So we can infer what was going on before that, even if we can’t see it directly. But eventually, at the Planck epoch ( 10−43 seconds after the bang), there’s another wall. As we go back in time, it gets hotter and denser, and eventually, the fundamental forces starts to unite. First electromagnetism and the weak nuclear force, then the strong nuclear force joins them, and finally, it gets so hot and dense that the fundamental force of gravity has to join the other three.

Gravity is described through the theory on general relativity, while the other are described by quantum mechanics. We know how they work pretty well, but … they don’t play nice together. The point is that we don’t have a theory that allows us to combine gravity and the other three fundamental forces. It is possible that a theory on quantum gravity may be what we need. It is possible that such a theory could be found in string theory. But string theory is incomplete, and also may not be the physics theory we need, or even be right. Since we can’t see what happened before 380,000 years after the bang, and since we can’t infer what happens before the Planck epoch, the moment of the Big Bang remains beyond our grasp. That doesn’t mean that we can’t speculate, though. We just can’t test those speculations (such as this one) to see which – if any – is the correct one.
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Planck Epoch - In the time before the first 10-44 seconds of the Universe, or the Planck Epoch, the laws of physics as we know them break down; the predictions of General Relativity become meaningless as distance scales approach the Planck length at which random quantum mechanical fluctuations dominate.

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