Answer:
The Big Bang occurred more than 13.8 million years ago. It created much of our current universe, but stars were not present in the early universe, instead forming more than 100 million years after the initial event.
Our current universe as we know it is expanding. As it expands, our galaxies distance themselves from one another. However, the Big Bang theory explains that this was less of a “bang”, and more of an expansion.
Originally, everything in our universe was compressed into one tiny dot. Out of this dot expanded into the universe, as originally the early universe was much smaller.
The Belgian Priest Georges Lemaître is credited with first theorizing the Big Bang back in the 1920s. Lemaître thought that our universe as we know it must still be expanding.
Although discovered by Lemaître, the term Big Bang was coined by English astronomer Fred Hoyle.
However, it wasn’t until the 1940s and 50s that the theory really took off with many astronomers considering it a possibility.
We don’t know of anything existing earlier than the formation of our universe, but it is definitely a possibility.
The heat present in the earlier times of the universe is the reason for all of the hydrogen helium and many other gases that are present.
Although we know that ideas about the Big Bang theory were derived from Einstein, he didn’t believe the theory could be correct. Einstein’s general theory did bring up the idea of an expanding universe though.
It wasn’t until 9 billion years after the Big Bang that our solar system was formed, as our planet and Sun is actually relatively young in comparison to the whole universe.
As the galaxies are moving away from each other, eventually they will become invisible to us.
Hand in hand with the Big Bang model comes the theories about the expansion of the universe. This kind of explains how we were formed from such a small space, and why galaxies move over time.
It’s thought that the universe will either eventually freeze due to its expansion, or there will be so much mass in the universe that it will retract back into itself.
Explanation:
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