star systems and galaxies galaxies and the big bang theory

Star Systems and Galaxies

Galaxies and the Big Bang Theory

Galaxies

• A Radio Telescope is a device used to detect long radio waves coming from objects in space.

• A galaxy is a huge group of single stars, star systems, star clusters,dust, and gas bound together by gravity

• The three different types of galaxies that exist in our universe are:

• Spiral Galaxies• Elliptical Galaxies• Irregular Galaxies

http://images.google.com/imgres?imgurl=http://www.windows.ucar.edu/the_universe/images/galaxies/m31.gif&imgrefurl=http://www.windows.ucar.edu/the_universe/images/galaxies/m31_gif_image.html&h=390&w=480&sz=126&hl=en&start=6&um=1&tbnid=2uVIEh6aK0ukJM:&tbnh=105&tbnw=129&prev=/images%3Fq%3Dgalaxy%26svnum%3D10%26um%3D1%26hl%3Den%26c2coff%3D1

Spiral Galaxies

• The shape of a spiral galaxy is a bulge in the middle and arms that spiral outward like pinwheels

• Many bright, young stars

• Spiral galaxies contain gas and dust

Elliptical Galaxies

• Look like round or flattened balls

• Billions of stars

• Contain very little gas and dust between stars

• Old stars because little gas or dust and no stars are forming any longer

http://images.google.com/imgres?imgurl=http://www.star.le.ac.uk/edu/Root_folder/m87.gif&imgrefurl=http://www.star.le.ac.uk/edu/Elliptical.shtml&h=270&w=340&sz=38&hl=en&start=15&um=1&tbnid=tp-P4C7g0xnHhM:&tbnh=95&tbnw=119&prev=/images%3Fq%3Delliptical%2Bgalaxy%26svnum%3D10%26um%3D1%26hl%3Den%26c2coff%3D1

Irregular Galaxies

• Galaxy without a regular shape

• Smaller than other galaxies

• Many bright, young stars

• Lots of gas and dust to form new stars

http://images.google.com/imgres?imgurl=http://starchild.gsfc.nasa.gov/Images/StarChild/universe_level2/ngc6822.gif&imgrefurl=http://starchild.gsfc.nasa.gov/docs/StarChild/universe_level2/ngc6822.html&h=232&w=273&sz=28&hl=en&start=1&um=1&tbnid=lYq5SMkkKwzN6M:&tbnh=96&tbnw=113&prev=/images%3Fq%3Dirregular%2Bgalaxy%26svnum%3D10%26um%3D1%26hl%3Den%26c2coff%3D1

http://images.google.com/imgres?imgurl=http://sci.esa.int/science-e-media/img/db/irregular%2520galaxy.jpg&imgrefurl=http://sci.esa.int/science-e/www/object/index.cfm%3Ffobjectid%3D36827%26fbodylongid%3D1728&h=261&w=300&sz=54&hl=en&start=10&um=1&tbnid=La0SzqrklE4CyM:&tbnh=101&tbnw=116&prev=/images%3Fq%3Dirregular%2Bgalaxy%26svnum%3D10%26um%3D1%26hl%3Den%26c2coff%3D1

Milky Way

• Our solar system is located in a spiral galaxy called the Milky Way.

http://images.google.com/imgres?imgurl=http://www.coseti.org/images/m31.jpg&imgrefurl=http://www.coseti.org/milkyway.htm&h=513&w=640&sz=96&hl=en&start=8&um=1&tbnid=aE5drfSldd-3mM:&tbnh=110&tbnw=137&prev=/images%3Fq%3Dmilky%2Bway%2Bgalaxy%26svnum%3D10%26um%3D1%26hl%3Den%26c2coff%3D1

The Expanding Universe

• Big Bang Theory– Universe formed in an instant– Billions of years ago– Enormous explosion

• Universe is expanding– Leftover thermal energy from the big bang is cosmic

background radiationEvidence that supports the Big Bang Theory-Hubble studied the light spectrum of distant galaxies and observed that it

shifted toward the red end of the spectrum-Hubble compared a galaxies’ spectrum to its distance and found a red shift (object moving away=longer wavelength (red)

star systems and galaxies galaxies and the big bang theory

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