Timeline Project: Big Bang Theory
By Emily Falkenstein and Ava Earl
The Big Bang occurred between 13.7 billion years ago. It is a popular and well known theory to how the universe started. In this theory, it was a small, dense ball of energy which exploded in the initial singularity, starting the universe. It has been expanding ever since, and there are many theories to what will eventually happen. The first is the closed universe (Ω>1), where the world stops expanding, and instead collapses in on itself and goes back to the dense matter it began as. There is another theory that goes along with the closed universe called the oscillating universe, in which it explodes and collapses over and over. The second theory is the open universe (Ω<1), where we will continue expanding forever. The last theory is the flat universe (Ω=1) where the universe contains just the right amount of matter to which it will stop expanding, and not collapse, but instead just stay the same.
The Big Bang occurred between 13.7 billion years ago. It is a popular and well known theory to how the universe started. In this theory, it was a small, dense ball of energy which exploded in the initial singularity, starting the universe. It has been expanding ever since, and there are many theories to what will eventually happen. The first is the closed universe (Ω>1), where the world stops expanding, and instead collapses in on itself and goes back to the dense matter it began as. There is another theory that goes along with the closed universe called the oscillating universe, in which it explodes and collapses over and over. The second theory is the open universe (Ω<1), where we will continue expanding forever. The last theory is the flat universe (Ω=1) where the universe contains just the right amount of matter to which it will stop expanding, and not collapse, but instead just stay the same.
After the Big Bang, many things occurred. Three minutes following, the universe cooled to 10 to the ninth k, and small helium nuclei formed. 300,000 years later it cooled enough for hydrogen and helium to form. These atoms eventually clumped to form clouds, and gravity formed stars in these clouds, which gathered to form galaxies. Reactions at the center of the stars made more massive elements like iron, and when these stars died and exploded they scattered the elements throughout space in stardust which later would make more stars and solar systems like ours.
References:
1. Sales, A. Time before time: Was there a "before the big bang?". (2007, August). Today's science. Retrieved from http://tsof.infobaselearning.com/recordurl.aspx?wid=14260&ID=19195
2. Angelo, J. A., Jr. Big bang theory. In Science online. Retrieved from http://www.fofweb.com/activelink2.asp?ItemID=WE40&SID=5&iPin=ESA0349&SingleRecord=True
References:
1. Sales, A. Time before time: Was there a "before the big bang?". (2007, August). Today's science. Retrieved from http://tsof.infobaselearning.com/recordurl.aspx?wid=14260&ID=19195
2. Angelo, J. A., Jr. Big bang theory. In Science online. Retrieved from http://www.fofweb.com/activelink2.asp?ItemID=WE40&SID=5&iPin=ESA0349&SingleRecord=True
Wow! This is pretty cool!
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