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Galaxies and Super structures

Galaxies and Super structures. Hubble Deep Field. What are galaxies?. Galaxies are systems made up of stars, gas, and dust. All galaxies have a center of mass that its stars orbit around. Galaxies can have from around ten million stars to a hundred trillion stars.

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Galaxies and Super structures

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  1. Galaxies and Super structures

  2. Hubble Deep Field

  3. What are galaxies? • Galaxies are systems made up of stars, gas, and dust. • All galaxies have a center of mass that its stars orbit around. • Galaxies can have from around ten million stars to a hundred trillion stars. • In 1999 the Hubble telescope estimated the total number of galaxies in the visible universe at 125 billion. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/021127a.html

  4. Galaxy Shapes

  5. Elliptical Galaxy M87

  6. Elliptical Galaxy NGC 4649 • http://chandra.harvard.edu/photo/category/galaxies.html

  7. Galaxy ShapesElliptical (E0-E7) • Elliptical galaxies can range from nearly round to flatter, football-like shapes. • Elliptical galaxies are appear to be made up of older stars and have low rates of new star formation.

  8. Whirlpool Galaxy • http://chandra.harvard.edu/photo/category/galaxies.html

  9. Spiral Galaxy M101 • http://chandra.harvard.edu/photo/category/galaxies.html

  10. Galaxy ShapesSpiral (Sa, Sb, Sc) • Spiral galaxies have the following characteristics: • A flat, rotating disc of (mostly newly created) stars and interstellar matter • A central stellar bulge of mainly older stars, which resembles an elliptical galaxy • A supermassive black hole at the very center of the central bulge • Arms of stars radiating out from the central bulge. • http://en.wikipedia.org/wiki/Spiral_galaxy

  11. Barred Spiral Galaxy NGC 2903 • http://en.wikipedia.org/wiki/File:NGC_2903_GALEX.jpg

  12. Barred Spiral Galaxy NGC 1300 • http://en.wikipedia.org/wiki/File:Hubble2005-01-barred-spiral-galaxy-NGC1300.jpg

  13. Galaxy ShapesBarred Spiral (Sba, SBb, SBc) • Rather than a bulge, barred spirals have a bar shape in their centers. • The bar of barred spiral galaxies is thought to be the birthplace for new stars. • The Milky Way is a barred spiral.

  14. Hoag’s Object (Ring Galaxy) • http://en.wikipedia.org/wiki/File:Hoag%27s_object.jpg

  15. NGC 5866 (Lenticular Galaxy) • http://en.wikipedia.org/wiki/File:File-Ngc5866_hst_big.png

  16. Colliding GalaxiesAntennae Galaxies

  17. Galaxy ShapesIrregular • Although most galaxies in the universe are elliptical or spiral, some have irregular shapes. • Galaxies with irregular shapes are thought make up about ¼ of all galaxies. • These galaxies shapes are thought to be caused by gravitational forces of larger neighboring galaxies.

  18. What are Super Structures? • Super structures are clusters and superclusters of galaxies. • Clusters and superclusters form large, orderly structures called filaments and walls.

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