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The Milky Way Galaxy

Dr. Robert E. Nahory
The Milky Way Galaxy

The Milky Way galaxy is a spiral galaxy
of at least 200,000,000,000 stars.

Our Sun lies within the Orion Arm about 26 000 light years
from the center of the galaxy.
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 the
center.
The Sun is located in the Orion Arm
The Milky Way is surrounded by several dwarf galaxies,
typically containing a few tens of millions of stars
The Sun
              The Milky Way Galaxy – from above
The 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.
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 Galaxy

This 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 plentiful
as you move away from the galaxy.
Galaxies that look like the Milky Way Galaxy
The Milky Way Galaxy - as we see it




        An all-sky plot of the 25000 brightest stars
shows how these stars are concentrated along the Milky Way.
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.
Milkyway galaxy

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Milkyway galaxy

  • 1. The Milky Way Galaxy Dr. Robert E. Nahory
  • 2. The Milky Way Galaxy The Milky Way galaxy is a spiral galaxy of at least 200,000,000,000 stars. Our Sun lies within the Orion Arm about 26 000 light years from the center of the galaxy.
  • 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 the center.
  • 4. The Sun is located in the Orion Arm
  • 5. The Milky Way is surrounded by several dwarf galaxies, typically containing a few tens of millions of stars
  • 6. The Sun The Milky Way Galaxy – from above The 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. 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 Galaxy This 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 plentiful as you move away from the galaxy.
  • 8. Galaxies that look like the Milky Way Galaxy
  • 9. The Milky Way Galaxy - as we see it An all-sky plot of the 25000 brightest stars shows how these stars are concentrated along the Milky Way.
  • 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.