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Spiral galaxies have three main components: a bulge, disk, and halo (see right). 

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Spiral galaxies have three main components: a bulge, disk, and halo (see right). 

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. The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars. The disk forms arm structures.

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. The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars. The disk forms arm structures.

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Our Sun is located in an arm of our galaxy, the Milky Way. The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk.

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Our Sun is located in an arm of our galaxy, the Milky Way. The halo of a galaxy is a loose, spherical structure located around the bulge and some of the disk.

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The halo contains old clusters of stars, known as globular clusters.

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The halo contains old clusters of stars, known as globular clusters.

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This is a spiral Galaxis

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Irregular galaxies have no regular or symmetrical structure. They are divided into two groups, Irr I and IrrII

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Irregular galaxies have no regular or symmetrical structure. They are divided into two groups, Irr I and IrrII

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 Irr I type galaxies have HII regions, which are regions of elemental hydrogen gas, and many Population I stars, which are young hot stars. Irr II galaxies simply seem to have large amounts of dust that block most of the light from the stars. All this dust makes is almost impossible to see distinct stars in the galaxy.

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 Irr I type galaxies have HII regions, which are regions of elemental hydrogen gas, and many Population I stars, which are young hot stars. Irr II galaxies simply seem to have large amounts of dust that block most of the light from the stars. All this dust makes is almost impossible to see distinct stars in the galaxy.

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Elliptical galaxies are shaped like a spheriod, or elongated sphere. 

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Elliptical galaxies are shaped like a spheriod, or elongated sphere. 

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 The larger the number, the more elliptical the galaxy is.

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 The larger the number, the more elliptical the galaxy is.

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 In the sky, where we can only see two of their three dimensions, these galaxies look like elliptical, or oval, shaped disks.

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 In the sky, where we can only see two of their three dimensions, these galaxies look like elliptical, or oval, shaped disks.

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All of these Galaxis   are in the Universe.

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All of these Galaxis   are in the Universe.

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Thanks for waching