Universe Cosmological – The Big Bang
When all started, the Universe is everything that we can ever know, all of space and all of time. Almost entirely empty with small clusters of matter and energy. The Universe is about 12.8 billion years old, but estimates vary, explosion is how scientists think the Universe began about 13.8 ago.
After the Big bang, the Universe although tehe Big Bang took place in just a fraction of a second, the explosion was strong enough to send energy and matter flying out at gra speed in all direction. No one is able to explain yet how or what might, if anything have come before the Big Bang.
First there was a hot tiny ball than atom, its temperature and density were to high to be understood by modern science. A split second after the Big Bang, super-force swelled the infant Universe a thousand billion times, scientists call this inflation, as it mushroomed out, the Universe was flooded with energy and matter, and the super-force separated into forces such as electricity and gravity. There were no atom at first, just a small particles such as quarks, i a dense soup a trillion times denser than water. The was also antimatter, the mirror image of matter, Antimatter and matter destroy each other when they meet, so they battled it out. Matter won but the Universe was left almost empty. Scientists believe about both space and time began with the Big Bang, there may possible be no time before it occured.
The afterglow of the Big Bang can still be detected as microwave background radiation coming from all over space, the Universe may have neither a centre nor an edge, because according to Einstein’s theory of relativity, gravity bends all of space-time around into an endless curve. The furthest galaxies yet detected are about 13 billion lightyears away. After few minutes, quarks started to fuse to make the smallest atoms and hydrogen, then hydrogen gas atoms fused to make helium gas atoms, million years later, the gases began to curdle into strands with dark holes between them, 300 years later the strands clumped into clouds and then the clouds clumped together to form stars and galaxies.
The Universe is expanding with all the galaxies rushing away from each other. Astronomers do not know if the Universe starts to contract, the galaxies would rush towards each other, then the Universe might end in a Big Crunch, the opposite of the Big Bang. This might set off another Big Bang and a brand new Universe.
About Lightyears and parsecs
Each distances are measured in miles or kilometres, but these units are too small to be useful in space. Scientists measure the Universe in lightyears of parsecs, light is the fastest thing in the Universe, so by measuring in lightyears scientists are able to get a better idea of such great distances. A lightyears is the distance that light travels in one year about 10 million km, a lightyears is roughly 3.26 parsecs, light from even the closest star take years to reach us. The nearest star is over four lightyears away, so this means that when astronomers look at it through a telescope, they are actually looking back into the past, seeing the star as it was four years ago. Light from the most distant galaxies take about 13.000 million years to reach us, the Universe may go on expanding forever, or it may eventually stop and collapse in on itself to possibly even start all over again.
Scientists have calculated that may be some hot ball just after the Big Bang must have swelled at a much faster rate even the speed of light, the hot ball would have grown at least a billion times larger within a fraction of a second.
At First, It’s a Hot Ball
The Entry Universe was a hot ball tinier than an atom and much hotter than any star. This swelled much and faster than the speed of light, growing a billion times, larger in just a tiny fraction of a second.
Hot Ball Began Cooling
After expanding of the Universe, it began to cool and tiny particles of energy and matter, each of them much smaller than atoms, began to form a thick, soup like material.
About three minutes, gravity started to pull the particles together, atoms joined together to make gases, such as hydrogen and helium, and the thick soup began to clear and thin out, the early universe continued to expand and cool for hundreds of thousands of years.
The Birth and Formation Galaxies
Over times, as the young Universe grew larger, the gases clumped into clouds, several hundred million years later, the clouds began to form stars and galaxies.