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The Milky Way

The Milky Way. Sum up. Introduction : the Milky Way’s identity View from Earth: a few explications Size and mass Age Spiral arms Environment Velocity Some order of magnitude. Introduction.

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The Milky Way

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  1. The Milky Way

  2. Sum up • Introduction: the Milky Way’s identity • View from Earth: a few explications • Size and mass • Age • Spiral arms • Environment • Velocity • Some order of magnitude

  3. Introduction • The Milky Way galaxy is visible from Earth as a band of light in the night sky, and it is the appearance of this band of light which has inspired the name for our galaxy.

  4. View from Earth

  5. Size and mass • Mass: about 5.8×10^11 • Size: approximately 10×10^4 light years in diameter, and about 10×10^2 light years thick.

  6. Age About 13.2×10^9 years

  7. Spiral arms There are four major spiral arms in the Milky way.

  8. Environment • The Milky Way and the Andromeda Galaxy are a binary system of giant spiral galaxies. Together with their companion galaxies they form the Local Group, a group of some 50 closely limited galaxies. Andromeda Galaxy

  9. velocity • Many astronomers believe that the Milky Way is moving at approximately 600 km per second.

  10. Some order of magnitude • 10^23 m: 10 million light years away from the Milky Way • 10^21 m: our galaxy, the Milky Way • 10^20 m: stars at the rim of the Milky Way galaxy • 10^19 m: stars in the Milky Way galaxy • 10^18 m: 100 light years from earth and nothing but stars • 10^13 m: our solar system • 10^9 m: the earth and the orbit of the moon

  11. The end Our references: • Images: Google • Text: Wikipédia http://www.eso.org/public/outreach/press-rel/pr-2004/pr-20-04.html. Nwnw.gsfc.nasa.gov/-5k-

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