Chapter 16.Galaxies

Chapter 16.Galaxies - Galaxies Chapter 16 1 M31 in...

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1 Galaxies Chapter 16
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2 M31 in Andromeda - large spiral galaxy surrounded by 2 small elliptical galaxies - similar to Milky Way but larger - nearest large galaxy to us
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3 The Milky Way is a spiral galaxy. Most galaxies that we can see are spiral galaxies. Looking at other spiral galaxies, we can begin to learn more about how our own Milky Way works.
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4 Spirals – 3 face-on one edge on
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5 2 colliding galaxies
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6 note large H II regions Spirals have gas and dust; old and young stars.
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7 Spirals
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8 The arms of spiral galaxies contain most of the bright, blue O and B type stars.
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9 Since O stars have such a short lifetime, it must be that: the arms of spiral galaxies are where star formation happens !
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10 If stars form in the spiral arms, how do they end up getting spread out over the whole disk? Spiral arms are not permanent , rather they are locations where stars are forming .
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11 If spiral arms are not permanent , then what is making these locations become active star forming regions?
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Chapter 16.Galaxies - Galaxies Chapter 16 1 M31 in...

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