Why is the Universe the Way it is?

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The discussion centers on the nature of the universe, questioning its vastness, the existence of stars, planets, gravity, and dark matter, as well as the presence of life and survival instincts. It highlights the paradox of existence versus non-existence, pondering why the universe or multiple universes exist at all. The Anthropic Principle is mentioned as a key concept, suggesting that the universe's physical laws must support the existence of observers. Ultimately, only universes that allow for observation can be recognized, leading to the current understanding of our universe. The conversation emphasizes the intricate relationship between existence and observation in the cosmos.
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Why is the universe a big, vacuumed space with stars and planets and gravity and dark matter? Why is there life and a need of survival for species? Why is there just nothing? No universe or anything, why is there a universe or multiple universes in the first place?
 
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Why not?
 
bp_psy hit the nail on the head.

But for further reading on one viewpoint, look up the Anthropic Principle.

In a nutshell: if it were not the way it is, we would not be here to observe it. So, of all the ways universes might have manifest - or not manifest - the only ones that get observed are the ones that have physical laws that support the evolution of an observer.
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
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Thread 'Hubble Constant, Dark Energy and the Expanding Universe'

Why was the Hubble constant assumed to be decreasing and slowing down (decelerating) the expansion rate of the Universe, while at the same time Dark Energy is presumably accelerating the expansion? And to thicken the plot. recent news from NASA indicates that the Hubble constant is now increasing. Can you clarify this enigma? Also., if the Hubble constant eventually decreases, why is there a lower limit to its value?
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