astronomy_aas

I am copying all of my astronomy paragraphs in here. I am giving them all proper titles. I am adding a picture to go with each paragraph.

From Big Bang to Galaxies

The formation of galaxies was a long and difficult process. The galaxy in which we live and all galaxies were formed from the Big Bang. The Big Bang was when the Universe exploded from nothing, it occurred about 15 billion years ago. The Big Bang was initially a mixture of matter, antimatter and radiant energy. The temperature cooled enough that hydrogen and helium formed. For the next 300,000 years the temperature continued to cool and the Universe continued to expand. It eventually became cooled enough that atoms formed. As the Universe expanded matter clumped together to for molecules. About 2 billion years after the Big Band, gravity collapses the matter and galaxies form. Our Galaxy, the Milky Way, formed 3 billion years after Big Bang. If it weren't for the Big Bang today our galaxy would not exist.



Formation of Galaxies

Most galaxies have a unique and different structure. The galaxy in which we live in is the Milky Way Galaxy. All galaxies are made up of stars, gas, and dust. They are 100,000 light years side-to-side. The central bulge is in the middle of the Galaxy. It is made out of disks of starts, lines of gas, and dust. In the Galaxy there is also a halo. A halo is globs of starts that formed when the galaxy first collapsed. Our sun lies in the disk of the galaxy. It is about half-way from the central bulge. The galaxy has 4 spiral arms. It is bluish, young starts, and pinkish, glowing hydrogen gas clouds.



Structure of the Galaxy

Most galaxies have a unique and different structure. The galaxy in which we live in is the Milky Way Galaxy. All galaxies are made up of stars, gas, and dust. They are 100,000 light years side-to-side. The central bulge is in the middle of the Galaxy. It is made out of disks of starts, lines of gas, and dust. In the Galaxy there is also a halo. A halo is globs of starts that formed when the galaxy first collapsed. Our sun lies in the disk of the galaxy. It is about half-way from the central bulge. The galaxy has 4 spiral arms. It is bluish, young starts, and pinkish, glowing hydrogen gas clouds.

Rotation of the Galaxy

Our galaxy has 4 spiral arms. The 4 arms are always rotating and reforming with new stars. Everything rotates counterclockwise. Our sun takes 250 million years to orbit once travelling at 250 km/s. In the middle of our galaxy is a massive black hole. The galaxy rotates too fast. There is dark matter that we cannot detect. It is pulling on us. Since we cannot see the dark matter and cannot feel the galaxy rotating, our galaxy might actually be about 5 times the size we see.



Formation of Planets

In our solar system there are different planets and they are all in different formations. In the outer solar system are 4 very large plants. They are Jupiter, Saturn, Uranus, and Neptune. They then grew disks of their own and moons condensed. The force was so large that the planets stayed in this circular motion that it help onto a thick atmosphere of gas. In the inner solar system there were too many collisions for large planets to form. The 4 terrestrial planets came to be. They were Mercury, Venus, Earth and Mars. They circled around the sun. Their surfaces were bombardment which created heat and inside heat was created. The soft material sunk to the middle and the hard rock rose to the top. It then cooled off and solidified.

Formation of Moons, Rings, and Comets

The moon was created in a collision with earth and another planet about the size of mars. The surface of the moon was crated with heavy bombardment. Most planetessimals were destroyed in collision. They were pushed away or went to the asteroid belt. Icy planetessimals from the outer solar system become comets if they reach the war facility of the sun. Rings around the giant planets are probably built by stray planetessimals and gravity pulling them apart.



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