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Milky Way Galaxy

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Alyssa Kleppinger

on 18 December 2013

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Transcript of Milky Way Galaxy

Milky Way Galaxy
Distance and Speed
The Milky Way Galaxy is about 100 lightyears across. The Solar System travels at about 515,000 miles per hour, and at this speed, it would still take around 230 million years to travel all the way around the Milky Way.
The Disk
The Milky Way Galaxy's disk holds most of the entire galaxy's dust and gas. The gas is mostly made up of hydrogen and helium. There is no visible boundary of the disk, rather, the density of the stars get smaller. The disk has, what are called, spiral arms. They hold hot, young stars that light up our night sky. So, the disk is important because it holds some of our major light sources.
The Galactic Bulge
Stars in the Milky Way Galaxy form a "galactic bulge". This bulge is the reason that you can only see a small amount of the total stars in the entire galaxy. Dust and gas within it are so thick that you can't even see into the bulge of the Milky Way, let alone see out the other side. The galactic bulge is the area of the galaxy with the most stars.
The Black Hole
The black hole has a size billions of times as massive as the sun. It is thought to have been smaller, but the extreme amount of gas and dust filled the black hole and allowed it to grow larger and larger. It also swallows any stars it can get its grip on, so that also affects its size.
The Milky Way Galaxy is made of dust, gas,and stars. There are three major parts of the Milky Way Galaxy: the disk, the bulge, and the halo. In the very center of the galactic bulge is a monsterous black hole. The Milky Way Galaxy has two major arms known as Scutum-Centaus and Perseus.
Basic Details
Galactic Bulge
Milky Way Galaxy Video Link
http://www.history.com/shows/the-universe/videos/behold-the-milky-way
(To open this video, you must copy and paste it into your search engine.)
The Halo
The halo of the Milky Way Galaxy is fairly spherical with little stars, gas, or dust. The halo has very old stars in it. The stars in the halo are in more of an elliptical orbit, so the stars in the halo pass through the disk and the nucleus, but spend a majority of the time in the halo.
A photo of the entire Milky Way Galaxy
Many of the spiral arms in the disk
The black hole in the center of the galaxy
Full transcript