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Galaxies

Galaxies. Galaxies. Milky Way Galaxy. 200 billion stars 100,000 light years in diameter 2,000 light years thick Sun is about 30,000 light years from galaxy’s center Local Group: small cluster of 17 galaxies (our neighbors) Andromeda is 2,000,000 lights years away.

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Galaxies

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  1. Galaxies

  2. Galaxies

  3. Milky Way Galaxy • 200 billion stars • 100,000 light years in diameter • 2,000 light years thick • Sun is about 30,000 light years from galaxy’s center • Local Group: small cluster of 17 galaxies (our neighbors) • Andromeda is 2,000,000 lights years away

  4. The Milky Way Galaxyhttp://map.gsfc.nasa.gov/ContentMedia/dirbe123_2p6dec.jpg

  5. Infrared Image of the Core of the Milky Way Galaxyhttp://en.wikipedia.org/wiki/Milky_Way

  6. Types of Galaxies • Spiral • Elliptical • Irregular • Galaxies are millions of light years apart!

  7. Spiral galaxies • Central lens-shaped bulge with millions of stars • Bright nucleus with millions of stars • 2 Spiral arms come out from opposite sides of nucleus • Arms trail behind as galaxy rotates • Milky Way is a spiral; ¾ of galaxies are spirals • Contain stars of various ages

  8. Spiral Galaxy IC342http://www.noao.edu/image_gallery/html/im1032.html

  9. Elliptical galaxies • Range from spherical to lens-shaped • No arms • Most of the stars are close to center • Little gas & dust clouds • No young stars or ongoing star formation • Contain old stars

  10. M60 Elliptical Galaxyhttp://www.calvin.edu/academic/phys/observatory/images/Astr111.Spring2007/Diaz.html

  11. Irregular galaxies • Small, faint, less common • Stars spread unevenly • Contain young, blue stars & old stars • Abundant gas & dust; vigorous ongoing star formation • Often found close to larger galaxies

  12. Small Magellanic Cloud: a dwarf irregular satellite galaxy of the Milky Way.http://www.astronomynotes.com/galaxy/s5.htm

  13. Quasars • Discovered 1961 • Emit radio waves, IR, visible, X rays • Most luminous objects (like 20 trillion suns) • Larger & more massive than any known star • Radiate light and radio waves at high rates • May be whole galaxies in early stage of development, but so distant that we can’t see the galaxy itself.

  14. Quasars continued • Most distant objects in the universe • 30,000 known, but the number is increasing as we have better probes

  15. Quasars in the act of colliding with their companion galaxies.http://www.rdrop.com/users/green/school/quasars.htm

  16. Link to Chandra Website image gallery • http://chandra.harvard.edu/xray_sources/quasars.html

  17. 19.3 • Read: p. 596 – 599 • Questions: p. 599 #1-6 (Put your answers in your notebook)

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