I found an article at,http://www.space.com/19915-milky-way-galaxy.html Our Galaxy (the Milky Way) is the most known galaxy to us because we live there. The Milky Way is a barred spiral, like billions of galaxies in space. When people from ancient times looked up, they seen space like a river, as milk, and also a path among other things out there. Our Milky Way is a spiral galaxy which is approximately 100,000 light-years away.
A barred spiral contains a bar across its center region which is unlike a regular spiral. Our Milky Way contains 2 major arms, also including 2 smaller spurs. The Orion Arm is one of the spurs which contains the solar system and the sun. Our Milky Way is constantly rotating. It basically never stays still. The arms are also moving through space. The solar system travels 515,000 miles per hour on average which is 828,000 kilometers per hour.
The spiral arms possesses a high amount of gas and dust. These newly stars are forming constantly within the arms. The Arms contained what is called a disk of the galaxy. It’s about 1,000 light-years thick. The center of the galaxy is called the galactic bulge. The milky way is compact of gas, dust, and stars.
In the center of the galaxy is a powerful black hole which is billions of times, massive as the sun. This massive black hole possibly started off smaller in size. The gas and dust caused the black hole to grow. Most galaxies have black holes in the center of the galaxy as scientist claim. The most obvious components of the Milky Way is the bulge and the arms. The most visible ingredients in the galaxy is the, stars, dust, and gas. It is also made up of dark matter. Scientist directly cannot detect this material. Similar to black holes, scientists can measure it basically by the the objects around it.
The milky Way is not just spinning, but is indeed expanding throughout the universe. Space is always filled with gas and dust. Scientists say that the milky will run into its neighbor, the Andromeda Galaxy. Those to galaxies are running toward each other at about 70 miles per second. When they collide, they will provide a fresh influx material.
The milky Way has over 200 billion stars and definitely has enough gas and dust to make billions of more stars. Solar system lies approximately 30,000 light-years from the center. More than half of the stars in the Milky Way are older than 4.5 billion years old. Red dwarfs are the most common stars in the galaxy.
In the 1920’s, astronomers thought that all the stars are contained in the milky way. Well, we know that that’s not true. The thought about that didn’t change until Edwin Hubble discovered a Cepheid variable, which helped him to measure precise distances. Astronomers realised that the fuzzy patches were classified as nebula were separate galaxies. My personal opinion of this article is overall good. I would recommend people should read it because it had a bunch of interesting facts about the Milky Way.
I learned about Galaxy classification. Bigger Galaxies have more stars. I learned from the clicker questions. For example, I learned why the arms of spiral galaxies are typically blue in color, it’s because stars are forming in the spiral arms which has a high mass and are very hot. That’s the reason. I learned about dark matter which is also mentioned in the article that I have presented. Also I learned about quasars and that if a quasar is a certain distance a away, it’s equivalent to how many years ago you were seeing it.