What is galaxy and how many different kinds are there?
By: Flavio Gutierrez
What is a Galaxy?MassiveConsists of:
StarsDustDark matter
ContainsPlanetsStarsMoon
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Big Bang TheoryCosmological Model13.8 billion years agoHow the universe started
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Types of Galaxies Types of Galaxies
Elliptical Spiral IrregularBarred Spiral
Hubble Sequence
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Elliptical GalaxyEllipsoidal profileLittle interstellar matterSmaller globular clusterLargest GalaxyExamples:
Maffei 1Centaurus A (NGC 5128)M32M49M59M60 (NGC 4649)M87 (NGC 4486)M90M105 (NGC 3379)
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Spiral GalaxyVery visible starsMost beautifulDesign is spiralExamples:
Milky WayAndromedaWhirlpoolTriangulumSunflowerPinwheel
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Irregular GalaxyNo shapeNot in any class of Hubble sequenceExamples:
Magellanic Cloud galaxy
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Barred Spiral GalaxyIs a spiral galaxy with central bar shapeCompose of starsExamples are:
NGC 1300Sculptor GalaxyM58M91M95M109NGC 1365NGC 2217Magellanic Clouds
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Lists of GalaxiesThere are trillions of galaxies in the worldMilky Way is one the galaxies
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References http://en.wikipedia.org/wiki/Galaxy#mediaviewer/File:NGC_4414_(NASA-med).jpg http://en.wikipedia.org/wiki/Galaxy http://en.wikipedia.org/wiki/Galaxy#Types_and_morphology http://apod.nasa.gov/apod/image/0406/m87_cfht.jpg http://en.wikipedia.org/wiki/Spiral_galaxy#mediaviewer/File:UGC_12158.jpg http://en.wikipedia.org/wiki/Irregular_galaxy#mediaviewer/
File:Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg http://en.wikipedia.org/wiki/Irregular_galaxy#mediaviewer/
File:Irregular_galaxy_NGC_1427A_(captured_by_the_Hubble_Space_Telescope).jpg http://en.wikipedia.org/wiki/Barred_spiral_galaxy#mediaviewer/File:Hubble2005-
01-barred-spiral-galaxy-NGC1300.jpg http://en.wikipedia.org/wiki/Barred_spiral_galaxy#mediaviewer/File:Hubble2005-
01-barred-spiral-galaxy-NGC1300.jpg http://en.wikipedia.org/wiki/Big_bang_theory#mediaviewer/
File:Universe_expansion2.png http://en.wikipedia.org/wiki/Big_bang_theory http://en.wikipedia.org/wiki/List_of_galaxies http://en.wikipedia.org/wiki/List_of_galaxies