astronomy_dwr

Within a fraction of a second our universe was created, it was called the “big bang”. It exploded from a small point of matter and energy. At first there was energy, quarks and anti-quarks which are the building blocks to neutrons and protons. At first it was also extremely hot but after 1 second it had to 1 billion degrees. Developed from collisions there is now neutrons and protons which join with electrons to create atoms. Together they create the most abundant element on the earth: hydrogen. That is one theory on how our universe was created.
 * __ From big bang to galaxies __**



After the big bang galaxies started to form. At first our galaxy was a huge sphere of gas. Then stars formed within the sphere. The rest of the gasd that did not turn into stars formed into a disc around a central bulge. The new galaxy also have arms coming out from the bulge, there are many different shapes and sizes of galaxies. Earlier galaxies were much closer together, so collisions we more often and the collisions were what caused the spiral arms. That is how galaxies are formed.
 * __ Formation of galaxies __**



The Milky Way galaxy is a flat disc of stars about 100,000 light years across with a central bulge in the middle. There is a thin layer of gas that runs horizontally through it. The sun is in the disc about half way out from the galactic center. There are four spiral arms that flow out form the middle. In the central bulge the stars are mostly red and yellow because they are all old. In the very middle of the bulge there is most likely a black hole. The milky way galaxy is very interesting.
 * __ Structure of the galaxy __**



__** Rotation of the Galaxy **__ On our galaxy four spiral arms form outward from the central bulge. The whole galaxy is turning but each star and gas cloud is going in its own orbit. The spiral are where matter temporarily piles up. The way our galaxy rotates tell us that we are surrounded by a huge invisible corona containing 10x material than we actually see. The galaxy may be 5x bigger than it appears.



__**Formation of the planets**__ We have lots of planets and stars in our galaxy. The sun like all stars formed when gravity formed a cloud of inter-stellar gas.The sun grew out a disc and in the disc large solid particles started to collect, they were called planetesimal's. Far from the sun where is was coldest icy planetesimals survived.



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