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Galaxies and the Universe
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Slide 1

Galaxies and the Universe

Galaxies and the Universe

Slide 2

What Are Galaxies?

What Are Galaxies?

Greek galax = milk

William Herschel, 1783: A disk with the Sun slightly off-center

Slide 3

What Are Galaxies?

What Are Galaxies?

19th Century: Spiral Nebulae

Nearby? Maybe Solar Systems in Formation?

1920: Galaxies are Stars

1920s: Galaxies are like the Milky Way

Biggest single increase in our mental picture of the Universe in human history

Slide 4

Where Are We in our Galaxy?

Where Are We in our Galaxy?

The visible Milky Way suggests our galaxy is a flat disk

Surrounding other galaxies is a spherical halo of Globular Star Clusters

Slide 5

Galaxies and Globular Clusters

Galaxies and Globular Clusters

Slide 6

The Milky Ways Globular Clusters

The Milky Ways Globular Clusters

Slide 7

The Milky Way As We See It

The Milky Way As We See It

Slide 8

Anatomy of a Galaxy

Anatomy of a Galaxy

Slide 9

Spiral Arms

Spiral Arms

Slide 10

In Microwaves, We Can See the Hub of the Galaxy

In Microwaves, We Can See the Hub of the Galaxy

Slide 11

Mapping the Neighborhood

Mapping the Neighborhood

Slide 12

Mapping the Neighborhood

Mapping the Neighborhood

Slide 13

Mapping the Galaxy: Not There Yet

Mapping the Galaxy: Not There Yet

Slide 14

Mapping the Galaxy: Not There Yet

Mapping the Galaxy: Not There Yet

Slide 15

The Local Group

The Local Group

Slide 16

Downtown: The Virgo Cluster: 50 m.l.y

Downtown: The Virgo Cluster: 50 m.l.y

Slide 17

The Local Super-cluster

The Local Super-cluster

Slide 18

The Coma Cluster 350 m.l.y.

The Coma Cluster 350 m.l.y.

Slide 19

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