Essay on Galaxies Essay on Galaxies Galaxies are massive systems, which contain stars, gas and dust. These systems come in a variety of sizes, ranging from several million to several trillion stars.
Essay on Galaxies Essay on Galaxies Galaxies are massive systems, which contain stars, gas and dust.
These systems come in a variety of sizes, ranging from several million to several Essay galaxy stars. They also come in a variety of shapes.
These shapes can be classified using the Hubble Essay galaxy system. The four classes of galaxies are the spiral Sthe barred spirals SBellipticals E and irregulars I. In this report I will be discussing spiral and barred spiral Galaxies and the reason why they spiral.
Spiral Galaxies and barred spiral Galaxies have similar appearances as they all contain arced arms of stars, a central bulge and a spherical halo. The arms have stars continuously being born and dying. These areas are full of small, young, metal rich population I stars, HII regions or clouds of cold ionized hydrogen, as well as heavier elements, which are sent into space when stars die.
The central bulge is usually about a few thousand light years across. This area is made up mainly of Population II stars. Population II stars are older, reddish, metal poor stars. There are very few of these stars being born.
|The Best Custom Paper Writing Service||This section contains words approx. Nearly all the matter in the universe is concentrated in galaxies.|
|kaja-net.com Review | AussiEssayServices||Galaxy Galaxies are categorized according to their visual morphology as elliptical, spiral and irregular. Many galaxies are thought to have black holes at their active centers.|
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Finally the halo is composed of dark matter and older star, which holds the galaxy together by surrounding the disk. A difference between the spiral and barred spiral galaxy is the area of the galaxy where the arms extend from. The arms of the barred spiral Galaxy are extended out of the ends of the bar shaped area, which runs through the galaxies nucleus, instead of from the nucleus itself as the spiral galaxy does.
Once we have the galaxies classified into spiral and barred spiral, we can further classify them into a, b, and c types. There are several differences between these types. First there is the difference in gas content, which increases from a to c, second there is the difference in the size of the nuclear bulge, which decreases from a to c, third the nature of the spiral arms differ with younger features such a HII regions in showing up more in type c than a.
The pitch angle of the arms and total mass of the galaxy are the last two features. The pitch angle is tighter in a-type galaxies and more open in c type galaxies.
Lastly type a galaxies are more massive than type c.The Final Response of the Ultimate Hitchhiker's Guide to the Galaxy Essay hhikers Guide to the Galaxy Since the first book in the Hitchhiker's Guide to the Galaxy was only pages, I decided to read the first two books instead, so this second reader response is on the second book.
An Essay on Galaxy for Kids and Students A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally “milky”, a reference to the Milky Way.
Iphone 5 vs samsung galaxy s4 Essay IPhone 5 V.S.
Samsung Galaxy S3 In today’s world of technology there is a great battle between many tech geeks out there about which smartphone is superior in today’s market. Essay The Impact of the Andromeda-Milky Way Collision - The discovery of the vast universe, that exists outside our galaxy, began with Edwin Hubble’s discovery of a Cepheid Variable star in Andromeda, which he used to measure the distance to our neighbouring galaxy (Bennett et al.
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