Galaxy Formation : la formación de galaxias |
Types of Galxies : tipos de galaxias |
Galaxy Formation began shortly after the Big Bang with collapsing gas and dust clouds. A galaxy is a large group of stars, gas, and dust held together by gravity. Galaxy formation began 14 billion years ago when gas and dust collapsed starting the formation of a galaxy. Starting from the beginning of galaxy creation was the idea that the universe is expanding. This idea is called the Hubble Law. It is possible to use the this idea of expansion to tell the age of the Universe.
You can do this by seeing how far away a galaxy is. The further away a galaxy is, the older it is. Most theories state the 1. The Universe was filled with hydrogen and helium and 2. The Universe had certain areas that were slightly denser than others. Using this information, the Hubble Law, and pure guesswork we can speculate in four steps in summary, of how a galaxy is formed.
The first step is when rotating bodies of gas, dust, and young stars collide. Next, the stars begin to rotate around the center of mass. Then, the rotation contracts the cloud and forms a galactic disk. A galactic disk is the plane in which the spirals, bars, and discs galaxies exist. Finally, motion created by the spinning disk causes spiral arms to form. That in a very simple, quick sense is how a galaxy is formed.
There are three main types of galaxies. They are the spiral, elliptical, and the irregular. Breaking it down even further, a sub-section of spiral galaxies is the barred spiral, which our home galaxy, the Milky Way, is considered. There is also the normal spiral galaxy which our neighbor galaxy the Andromeda galaxy is considered. Spiral galaxies include spiral arms that wind outward from the galaxy's center. Those arms are made up of bright stars, gas, and dust. You would think that the most common galaxy is the spiral, but it is not. The most common type of galaxy is the elliptical. Elliptical galaxies are mostly dwarf galaxies and are shaped like large, three dimensional ellipses.
Finally, if a galaxy is not spiral or elliptical then it is an Irregular. Irregular galaxies can take many different shapes and contain millions to billions of stars. They are the least common of the three types of galaxies. Two widely known Irregular galaxies are the Clouds of Magellan.
With some many galaxies, the question is raised. "What happens if they run into each other?" Actually the stars in a galaxy have so much space between them that they don't really run into each other. They actually just move past each other. When galaxies collide a burst of star formation occurs. You can actually can tell when this happens by the blue light emitted by young stars. Sometimes, a galaxy can actually lose it's overall structure or shape. For example, a spiral galaxy may lose all of it's spiral shape completely.
You can do this by seeing how far away a galaxy is. The further away a galaxy is, the older it is. Most theories state the 1. The Universe was filled with hydrogen and helium and 2. The Universe had certain areas that were slightly denser than others. Using this information, the Hubble Law, and pure guesswork we can speculate in four steps in summary, of how a galaxy is formed.
The first step is when rotating bodies of gas, dust, and young stars collide. Next, the stars begin to rotate around the center of mass. Then, the rotation contracts the cloud and forms a galactic disk. A galactic disk is the plane in which the spirals, bars, and discs galaxies exist. Finally, motion created by the spinning disk causes spiral arms to form. That in a very simple, quick sense is how a galaxy is formed.
There are three main types of galaxies. They are the spiral, elliptical, and the irregular. Breaking it down even further, a sub-section of spiral galaxies is the barred spiral, which our home galaxy, the Milky Way, is considered. There is also the normal spiral galaxy which our neighbor galaxy the Andromeda galaxy is considered. Spiral galaxies include spiral arms that wind outward from the galaxy's center. Those arms are made up of bright stars, gas, and dust. You would think that the most common galaxy is the spiral, but it is not. The most common type of galaxy is the elliptical. Elliptical galaxies are mostly dwarf galaxies and are shaped like large, three dimensional ellipses.
Finally, if a galaxy is not spiral or elliptical then it is an Irregular. Irregular galaxies can take many different shapes and contain millions to billions of stars. They are the least common of the three types of galaxies. Two widely known Irregular galaxies are the Clouds of Magellan.
With some many galaxies, the question is raised. "What happens if they run into each other?" Actually the stars in a galaxy have so much space between them that they don't really run into each other. They actually just move past each other. When galaxies collide a burst of star formation occurs. You can actually can tell when this happens by the blue light emitted by young stars. Sometimes, a galaxy can actually lose it's overall structure or shape. For example, a spiral galaxy may lose all of it's spiral shape completely.
This slideshow contains a few examples of different types of galaxies and steps of galaxy creation.
What is a galaxy composed of?
What is the idea that the Universe is expanding called?
How far away a galaxies is determines it's...
What are the three main types of galaxies?
What happens when galaxies collide?