First Exam Post: The Earth in Space

 Our Solar System lies where the Milky Way Galaxy's gas and dust is located. We are positioned about 14 light years above "the equatorial symmetry plane". The thickness of the disk is unknown, but, scientist believe that it is about 1,000 light years thick.  It is also unknown what the distance where our solar system is in relationship to our galaxy, they estimate it to be in between 26,000 and 28,000 light years away from the center. The size of the galaxy is still unknown and also, the time it takes our Solar System to orbit the Milky Way. The picture to the right shows the estimated path that our solar system takes around the Milky Way. The Galactic year is what we use to count how long it takes to orbit the galaxy, the Galactic year comes to about 200 to 250 million earth years, scientists don't know how long it actually takes because they do not know the speed at which our solar system travels. (1)
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 About 15 billion years ago is what the estimation is of when the Big Bang Theory happened, so, our universe is approximately 15 billion years old. The Big Bang Theory is explained to be a huge explosion that started the expansion of the universe, before this explosion, the universe was extremely compact and the older that the universe becomes, the farther away other galaxies are, because the universe is constantly expanding and has not stopped since the Big Bang explosion, this theory was introduced by Edwin Hubble. The age of the universe was tested by finding out the age of the oldest clusters of stars and estimating the age that they are, the oldest cluster of stars is approximately 15 billion years old. (2)

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 At the very beginning, "All the matter and energy which is now present in the universe was squeezed into this singularity of infinitely small volume." The Big Bang released tons of energy and matter. As soon as the Explosion occurred, an extremely large fireball formed, this is called the "primordial fireball", this fireball is  thought to be  as hot as  one million billion billion billion (which is 10 with 32 zeros) degrees Kelvin. (3)









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Bibliography

1.) SolarSystem
2.)BigBangTheory
3.)moreBigBang
4.)big bang picture