Astronomy 100 -- The Milky Way Galaxy



OUR GALAXY: THE MILKY WAY


An All-Sky Picture.

A Spectacular Image at the APOD Website!

Early "Model" of the Milky Way:
An infinite "sheet" of stars.


First Step in Unveiling the Milky Way (1915)


THE GREAT NEBULA DEBATE

In 1920, a "Great Debate" was held on the nature of the "Spiral Nebulae" between Shapley and Curtis.

In 1923-4, Hubble finds Cepheids in the Andromeda Nebula. From this he determined the distance to the Andromeda Nebula (a few million light-years) and showed it was a separate star system outside of the Milky Way!



MAPPING THE MILKY WAY

1) OPTICAL LIGHT: Dust limits how far we can see.

2) RADIO WAVES



COMPONENTS OF THE MILKY WAY

Edge-On View of the Milky Way Galaxy.

Total Mass = 2 x 1011 Solar Masses!!

A Top and Side View Diagram of the Milky Way.

Is our Milky Way Galaxy a Barred Spiral?



Death of High Mass Stars

Rotation Curves and Dark Matter

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