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Introduction
• Galaxies are large space systems that are made up of dust, gas, and several stars. There is no limit to the number of galaxies in the universe. At minimum, the universe may contain 100 billion galaxies.
Types of Galaxies
• There are four main types of galaxies, spiral, elliptical, lenticular and irregular.
• Spiral galaxies consist of a bulge, disk, and a halo. The disk includes new stars, planets, dust, and gas that all rotate around the center which is called the Galactic Center. The bulge consist of millions of old stars which are burning out at this very second.
• Elliptical galaxies consist of a bulge and a halo, but they lack a disk. Because they lack a disk elliptical galaxies have more old stars than new stars. The elliptical galaxy can be mistaken for the bulge of a spiral galaxy.
Types of Galaxies Continued
• Lenticular galaxies consist of only a disk, they have used up most of their matter and power. As a result they have very little stars and if there is a star it is an aged or old star.
• Irregular galaxies consist of a disk and a halo. An irregular galaxy has an irregular shape because it doesn’t have enough gravitational force to pull itself into a regular shape.
Lenticular galaxy Irregular galaxy
Our galaxy
• The galaxy that we reside in is the Milky Way. The Milky way is a spiral galaxy and has around 400 billion stars. The Milky Way is the second largest galaxy that has been discovered, the largest galaxy is the Andromeda Galaxy. The Milky Way is large because it consist of one cluster of 30 other galaxies.
Inside a Galaxy
• Inside a galaxy are planets, stars, and other smaller bodies in space. The planets make up solar systems in the galaxies. Solar systems have different numbers of planets, suns, stars, moons, and other matter formations. Other objects in space can include comets, meteors, meteoroids, asteroids, quasars (star like formations), and nebulas.
Dark Matter
• 12 to 14 billion years ago the big bang theory happened to make all the galaxies and matter in the universe. Today galaxies are still being formed. Particles that are not made up of protons or neutrons that were unable to create galaxies, planets, or stars became what we call dark matter. This is what scientist claim to be dark matter, but they’re not really sure what it’s purpose is.
Intergalactic Collisions
• Many collisions happen in the universe to form many things. For example, thirty different galaxies collided to make the Milky Way. Also a planetisimal crashed into the Earth to make the moon. In three billion years our galaxy, the Milky Way, will collide with the galaxy Andromeda.
Center of the Universe
• There is no actual center of the universe. When the big bang happened all matter didn’t expand out from the center of the universe. Everything is still expanding, but the Universe doesn’t expand from the middle outward it expands equally everywhere. Space never ends therefore there was never a middle or end and there never will be.
Bibliography
• National Geographic. National Geographic Society, 2009. Web. 1 Nov. 2009. <http://science.nationalgeographic.com/science/space/universe/galaxies-article.html>.
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2009. <http://seds.lpl.arizona.edu/messier/galaxy.html>. • Crecalde. Charlie, 22 June 2004. Web. 1 Nov. 2009.
<http://www.crecalde.com/Charlie/charlies_cosmos__milky_way.htm>.
• Crecalde. Charlie, 22 June 2004. Web. 1 Nov. 2009. <http://www.crecalde.com/Charlie/charlies_cosmos__nebula.htm>.
• Crecalde. Charlie, 22 June 2004. Web. 1 Nov. 2009. <http://www.crecalde.com/Charlie/charlies_cosmos__comet.htm>.
• Crecalde. Charlie, 22 June 2004. Web. 1 Nov. 2009. <http://www.crecalde.com/Charlie/charlies_cosmos__quasar.htm>.
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visionmedia/article.aspx?id=19151>. • math.ucr.edu. John Baez , 19 Oct. 2004. Web. 1
Nov. 2009. <http://math.ucr.edu/home/baez/end.html>.
• Acten. ACT360° Media Ltd. , 1 Nov. 2009. Web. 1 Nov. 2009.
<http://www3.actden.com/sky_den/formation.htm>.
• goastradio. Ulysses Ronquillo, 2 Apr. 2009. Web. 1 Nov. 2009. <http://ghostradio.wordpress.com/2009/04/02/>.
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The End
Directed by AnthonyProduced by AnthonyEdited by AnthonySpecial Thanks To MomAnthonySoft Corporations c2009
