Where Are We?
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Transcript of Where Are We?
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Where Are We?
I don’t think we’re in Kansas anymore, Toto!-Dorothy
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The Milky Way is a narrow band of Stars, gas and dust seen in the night sky
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The Milky Way is thickest near the constellation Sagittarius (the teapot)
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As you go away from Sagittarius the Milky Way gets thinner.
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Most of the Stars we see lie in the narrow plane (1,000 l.y.) of the Milky Way
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Globular Clusters are arranged above and below the plane of the Galaxy near Sagittarius
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For these reasons the center of our Galaxy is thought to lie in the direction of Sagittarius
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A large black hole is thought to hold the galaxy together with its powerful gravitational force
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Because of the positions and movements of the stars the shape of the Milky Way seems to be a barred spiral.
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The Galaxy is thought to be 100,000 light years in diameter, 1,000 l.y. thick and contain 200 – 400 billion stars
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We are about 27,000 l.y. from the center.
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Our solar system rotates around the galactic core once every 230 million years.
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The Milky Way is part of a cluster of galaxies known as the Local group
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Our sun is part of a local group of stars within the Milky Way
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The large and small magellanic clouds are small galaxies close to the Milky Way.
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Large Magellanic Cloud
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Small Magellanic Cloud
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Outside of the galaxies space is nearly empty of stars
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Andromeda is the largest galaxy in our local group. It is the farthest away object that can be seen with the naked eye.