astronomy_dsr

= __**Milky Way:**__ =

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Basically, the Milky Way Galaxy is a massive Galaxy that is made of many, many stars. The galaxy is made up of a ton of dust particles and millions of small stars. The Milky Way Galaxy has a flat disk of stars and has a thin layer of dust that cuts between the two layers of stars. At the center of the whole galaxy, there is a large hump. That hump is a massive black hole that is surrounded by dust. On the layer of dust and stars, the sun lies half way out from the middle to the left side. The Milky Way Galaxy is so big, it would take 100,000 years to get a light to get to the other side of the Galaxy. =====

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The rotation of the Milky Way Galaxy spins in a spiral rotation or kind of like a circle rotation. There are four large arms that hang out from the bulge. They can be classified as tightly wound around the bulge, loosely or somewhere in between. The spirals or the arms are mainly made up of thousands of thousands of stars. The stars are mostly made up of bright blue and yellow stars combined. The arms are also made up of pink clouds of helium and hydrogen gas. =====

= **__Big Bang to Galaxies:__** =

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Basically the Big Bang was an explosion in which our Universe expanded rapidly. Our universe has thought to have began 15 billion years ago. The Big Bang was when the universe started out being small and in a flash, it became a large universe in a matter of seconds. When the universe expanded, enormous amounts of energy and a ton of particles were created. The particles consisted of quarks and antiquarks. Protons, neutrons and antiprotons were being created also. After a million years or so, the earth finally started to cool down and electrons started orbiting neutrons. All of the atoms were created because the universe dropped in temperature. Then, as it got cooler, Helium and Hydrogen were then created. =====

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Galaxies had started being created after the big bang. In fact, about 2 billion years after the big bang, galaxies were starting to be created. You may be wondering how galaxies are formed. Galaxies have many steps for them to be created. First, galaxies are formed by gas. Then, the gas settles in a cluster and becomes tightened and hard. Then, some of the leftover gas and gas that comes off starts to spiral around the main part of the galaxy. Our galaxy although was formed about 3 billion years after the big bang. Also, not all galaxies are the same shape, there are three different galaxies classified as elliptical, spiral or irregular. =====

[[image:dsr_irregular.JPG caption="This is an irregular galaxy"]]
= __**History of the Solar System:**__ =

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Planets are made of disks. Basically, many particles accumulate together and pack into large plumps. Also space rocks come together, merge and get hit by bigger pieces and make bigger rocks which will soon make the planets bigger. The largest planets, are Jupiter, Saturn, Uranus and Neptune. The smaller planets include Mercury, Venus and earth and mars. The earth is heated rather then the others.=====

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The Moon was formed by a catastrophic collision between earth and something probably the size of mars. The surface of moon were crated by heavy bombardment for about a million years. That is how holes on the moon came to be. The rings came to be around big planets because of gravity and the planets forcing them to come in. The rings are mainly made up of many commits that are being torn apart. They all come together to create rings are the planet.=====

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