An external galaxy; a spiral like our own.

1
An external galaxy a spiral like our own.
2
An external galaxy a spiral like our own.
Which way does it rotate?
3
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
4
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
5
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
6
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
WRONG!
7
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
8
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
9
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
10
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
11
An edge-on spiral we can measure its rotation
12
An external galaxy a spiral like our own.
How does it rotate? i.e. what is rotation curve?
13
We believe that only 10 of the mass of this
object is baryonic matter (in the form of stars,
stellar remnants, interstellar gas, interstellar
dust) and the other 90 is dark matter
14
Vera Rubin showed that 90 of a typical
galaxys mass is dark matter
15
Except for the closest few galaxies, they are all
moving away from us (fast!)
16
Last 4 lectures - cosmology
wednesay
monday
monday 3/6
friday