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How did we get here? How did the planets get here? Well the Big Bang is the most consistent and accurate theory of how we got here along with everything else we see. Remember a theory cannot be a law. The Big Bang Theory was what happened before everything and before there was just nothing which was around 13.7 billion years ago. And the expansion of the universe. And the birth of light. And the expansion of the universe. The universe expanded from the size of a grape fruit. The Big Bang Theory is the leading explanation of how the whole universe began. And there was no explosion. We made Galaxies, stars. Our universe started very small, hot, and dense super force. ( Mix of the four cosmic forces.) With no atoms, stars structure or form called a singularity.  As this theory really cannot be proven it is still the most consistent theory as it may break some of the laws of science the Big Bang Theory is the most consistent. As telescopes advanced scientists could see more clearly and deeper into the universe. Everything in the universe we see like humans, water, rocks, forests, was created in the first seconds in the Big Bang.  In 1929, Edwin Hubble discovered galaxies aren’t static in 1 place and there are moving away from earth and this was the first actual evidence of the Big Bang. And Hubbles Law was created and his discovery is the starting point of the Big Bang. And he from seeing the motion of those galaxies was that the universe was expanding. And from the Hubble telescope allows us to see deep into our universe.  Hydrogen was the first  atom and then after a few million years it clumped together and gravity put it under pressure and created stars and galaxies and light was created and the dark age was over. And in the first second of the Big Bang, the universe that in which is made up of crucial particles and electrons, quarks, and energy, neutrinos and photons and then the less familiar types. Which then those particles smash together which form neutrons and protons. And then again we come back to Hydrogen, after 3 seconds in the Big Bang Neutrons and protons had came together and then form the nuclei of the simple elements most people know which are hydrogen, lithium and helium. And after that in 300 thousand years later at that one moment in time the energy in the matter and energy in radiation is equal. But still our universes expansion continues to go on. And our waves of the light are stretched out to lower and lower the energy and meanwhile the matter travels onward and is largely not affected. And even more after that 300 million years have passed and then our gravity has strengthens slightly irregularities in our density of the primordial gas. And even as our very universe continues rapidly expanding, pockets of gas become even more dense and then stars begin to ignite within those pockets, and the groups of stars have become our earliest galaxies and this point is still about 12 to 15 billion years before present time. And lastly it has been 3.8 billion years BP so then our Earth has cooled down and our atmosphere develops and develops and then microscopic cells that are living including animals and plants start to evolve and flourish into planet Earths multiple volcanic environments on Earth at the time. The Big Bang Theory says the temperatures in the early universe were that high that fusion reactions could happen. Which then resulted into the formation of our universes light elements like helium, deuterium and hydrogen were created so this is how they were formed so remember that’s different than the last paragraph. And the reasoning behind why heavy elements were not formed directly after the Big Bang is because there weren’t ant stable nuclei that had 5 or 8 nucleons.  And as Einstein has the equation of E=mc2 and it says that mass can be converted to energy and also vice versa. So Einstein didn’t know about the Big Bang well it wasn’t a thing yet. So mass can convert into energy and vice versa so then energy can be converted to mass. And if you extrapolate the rate of expansion and temperature of the universe back to much closer to the Big Bang that when the cosmic microwave background had been produced, and you find that in the first couple seconds of the Big Bang, and the energy of the photons was great enough to create particles. And anti-electrons that are called positrons and anti-protons. And the antimatter counterpart of an ordinary particle has the exact same mass and opposite charge of the ordinary particle but that is if it isn’t neutral. And when an ordinary particle and its antimatter counterpart will then collide and they destroy each other completely to make photons. And the process can be reverse if the photons contain enough energy. And in the first second of the Big Bang our universe was hot enough for the photon radiation to be able to go through this matter-antimatter particle transformation using gigantic particles like neutrons and protons. And when the temperature dropped to around 10 to the 13th K at 1 microsecond after  the Big Bang the process stopped for protons and it still continued for the less gigantic particles like the electrons.    Sources:www.astronomynotes.com

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