@r-gamer said:
So how did we get here? Just random meaningless bullshit? Superior beings from another planet? God? What is your view?
Entropy.
The succinct explanation of entropy is that heat wants to be evenly distributed. This would work just fine if it weren't for the attractive forces. Once you get clumps in the fabric, well...things start happening.
Before we go further, let's talk a bit about time. Surely you've heard that space and time are the same spacetime. That's...a failure of English and you can only really understand it if you know the math, but basically spacetime is a single 4-dimensional manifold. Movement in any direction affects movement in any other.
Our concept of time relies on being bound within this manifold. Outside such, we can only speculate. But speculate we have. Now, all the below is an attempt to allow you to visualize what math says. It isn't that this was envisioned and then the math worked to it. The math came first.
Imagine if you will two giant, gelatinous sheets of energy both at maximum entropy. Now these sheets are outside our manifold so they have more directions than up, right, left, down, back, forward and time. Eleven dimensions, if current theory is correct. You can't visualize it, not really. But the math...in the math its there. It just falls into place. Just bring known values into order just so, and there it is: Membranes.
But gravity here is strong.
All other forces are open strings...visualize them as vibrating electrical arcs attached between two points. They're attached to the membrane at both ends. But gravity...it's a closed loop. The only time it interacts with the membrane is when it collides with it.
Gravity leaks out of our universe. That's why it's such a weak force, though emanating most strongly from the most massive things.
The Membranes are thusly attracted to one another.
Upon collision, the momentum of two universes at maximum entropy is transferred one into the other. The Big Bang.
All directions expand rapidly as the Membrane itself expands...up, left, right, back, forward...time. It all expands. Massive amounts of energy heat everything up to a soup of energy. No matter exists here, only waves.
All the above is speculative. But it's based on known values allowed to expand into eleven dimensions. Everything below this line in not speculative, but based on observation.
As the universe cooled, electrons and protons began to combine to form the first hydrogen atoms. This event is recorded in the Cosmic Microwave Background, detectable at all points in space.
Hydrogen atoms began to collapse under gravity into the first giant, massive hydrogen stars. These are population III stars, and there are none left. Their existence is inferred by the remnants of what they left behind: all the light elements up to iron, fused in the massive, hot cores, and the heavier elements formed during the moment these massive stars exploded into hypernovas.
This spread these elements out into massive clouds of gasses and small clumps of matter. We do not know if these novas formed planets, as the amounts of heavy elements were scarce. However, the Population II stars that formed from these events are still around, such as the halo above and below our galaxy.
Population II stars are responsible for almost all the heavy elements currently in existence. From their supernovas, population I stars such as our sun formed. With enough heavy elements now to clump under their own gravity, planetary discs began to form around stars regularly. This is an ongoing, observable process.
https://www.skyandtelescope.com/astronomy-news/planet-forming-disks-revealed-in-stunning-images/
One thing that is special about our planet Earth is that it basically has one-and-a-half cores. This big, iron core allows it to generate a magnetic field that protects the surface from harmful stellar radiation. The current theory, based on analysis of lunar material, is that at some point in the distant past another planet the size of Mars collided with Earth. This is the Theia hypothesis, supported by all known data from both Earth and Lunar observations including gravitational, orbital, distribution of material, density and analysis of the lunar regolith.
The Earth otherwise experienced a pretty normal birth as far as rocky planets go. The Iron Catastrophe event (catastrophe in math just means a sudden change) separated our planet into the layers we observe today. This is when the vast majority of heavy iron migrated to the core. It's this solid/liquid rotating core that generates our magnetic field.
As the Earth settled into a slightly wobbly orbit after the Theia impact, the icy bodies that now make up the Oort Cloud were still on haphazard orbits, and the planets were common impact targets of these bodies. The few of these objects that remain on erratic orbits and have not impacted any of the planets yet we call comets.
Comets brought much water to the planets, but only Earth was able to maintain most of the water due to various reasons. Mercury is just too close to the sun. Though it has a magnetosphere, the amount of solar wind it is exposed to ensures any gas above the surface is quickly blown away. On Venus, water is gaseous due to the temperature, it is then broken up into its component oxygen and hydrogen atoms in the upper atmosphere due to interaction with the solar wind and lack of a strong magnetosphere. And so on.
Comet Impact synthesis is known to create all four RNA base pairs. Bring these base pairs into close proximity, such as an evaporative tidal pool, and they both begin to form long chains and self-replicate. Though, they replicate in reverse, so only every-other replication is an exact copy, baring mutation.
This is the RNA world. Components of this world remain at the sub-cellular level. Transcriptase is the bridge between the RNA and DNA world, as all cellular function still relies on RNA to model proteins.
Lipids have a hydrophobic end and a hydrophilic end. This means they self-arrange into a bi-layer when suspended in water. These lipid bi-layers form the membranes around all cellular organelle, as well as the cell membrane itself.
Again, throw these into the evaporative tidal pool with the replicating RNA chains, and you have a recipe for life.
That we have not found this occurrence on another world yet should not be surprising. Other than our own, we have visited one: The Moon. Of the rocky worlds, we have landed remote vehicles on three: Venus, Mars and Titan.
We have only in the past 20 years began to confirm planets around other stars. Our furthest probes, Voyagers 1 and 2, have only just begun their journey into interstellar space within the past few years, after having launched in 1977.
The distances in space are vast. So vast, that even communication at the speed of light is a process of patience.
As distant as the Voyagers are, were we not to know their exact location and frequency, they would be invisible to us, lost in the static of the Cosmic Microwave Background. That we have not heard other life on the radio is also not surprising.
Knowledge is progressive. What we know today is the basis for what will be understood tomorrow. There isn't a finish line, just a more thorough understanding.
20 years from now, we'll have answers we can only speculate on now. 100 years from now, what we know now will be considered elementary, though required understanding.
Science is beautiful in its ability to explain through process what would otherwise seem almost magical. That we are here, as an exercise in entropy...the universe trying to get back to that maximum equilibrium causes everything to fall together, to happen. Every thought you have, every movement you make, excises chemically stored energy from the universe forever though dissipation of heat and electrical impulses.
That energy will never be recovered. This transition, this line between matter and the dissipation of energy into heat and electrical impulses, is where life resides. It is indeed a wondrous occurrence of physics, but physics it is.
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