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Milkyway galaxy


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Milkyway galaxy

  1. 1. The Milky Way GalaxyDr. Robert E. Nahory
  2. 2. The Milky Way GalaxyThe Milky Way galaxy is a spiral galaxyof at least 200,000,000,000 stars.Our Sun lies within the Orion Arm about 26 000 light yearsfrom the center of the galaxy.
  3. 3. The Milky Way galaxy is a spiral galaxy of about 200,000,000,000 stars.Our Sun lies within the Orion Arm about 26,000 light years from thecenter.
  4. 4. The Sun is located in the Orion Arm
  5. 5. The Milky Way is surrounded by several dwarf galaxies,typically containing a few tens of millions of stars
  6. 6. The Sun The Milky Way Galaxy – from aboveThe Sun is in the Orion Arm, about 26,000 light-years from the center.The whole galaxy is more than 90,000 light-years across.
  7. 7. The Milky Way Galaxy – Properties Properties of the Milky Way Diameter of the Galaxy 90 000 light years Classification of the Galaxy SBbc Number of stars in the Galaxy 200 billion Mass of the Galaxy 1 trillion solar masses Length of the central bar 25 000 light years Distance of the Sun from the center 26 000 light years Thickness of the Galaxy at the Sun 2000 light years Velocity of Sun around the Galaxy 220 km/s Orbital period of Sun around the 225 million years center of the GalaxyThis is a list of some of the main parameters of the Milky Way Galaxy.Most of these numbers are approximate.Galaxies do not have precise boundaries – the stars slowly become less plentifulas you move away from the galaxy.
  8. 8. Galaxies that look like the Milky Way Galaxy
  9. 9. The Milky Way Galaxy - as we see it An all-sky plot of the 25000 brightest starsshows how these stars are concentrated along the Milky Way.
  10. 10. The Milky Way Galaxy - as we see it Infrared view of the Milky Way Galaxy.Dark regions in this image are huge clouds of galactic dust.