Prof. Mel Ulmer

DEPT OF PHYSICS

&

ASTRONOMY

http://www.astro.edu/astro/faculty/ulmer/a01_fall2002.html

TA: David Lin

d-lin@northwestern.edu

Office hours: Thursdays 4:00-5:00

For help with Cepheid variable lab,

Make an appointment

No discussion sections this week of Sep. 23

• Discussion sections: can come to more than one.

•Discussions sections (see syllabus also) all in Tech:

•Th., 2-3 (L170) 3-4 (LG66) U; Fri. 12-1 LG68, 1-150 M349 Lin

Sun, 8 light minutes

Mars, 12 light minutes

Jupiter, 40 lt min.

Pluto and Charon, 300 lt min

A star with planets forming; 50 lt year

Andromeda, a Galaxy like ours, 2 million lt yrs

100 billion

Stars; 100,000 lt yrs across

You are here!

Virgo cluster, 60 million lt yrs

1000 galaxies, 6 million lt yrs across

Coma Cluster, 360 million lt yrs, 1000 galaxies6 million lt yrs across

A cluster 4 billion lt yrs

1000 galaxies, 6 million lt yrs across

Hubble Deep Field, 10 billion lt yrs

Brick Wall, 15 billion lt yrs

BOOMERANG

Top Hat

DASI

COBE

Planck

Planck

Maybe we already know!

closed flat open

Data

Models

Maybe we already know, part I, extended

Need to

Assume ordinary matter,

WIMPS,

Dark energy

To make curve

Blocks=Data

Now we know, II

Maybe we already know, III

SN Ia CMB

clusters

Mauna Kea, On Big Island

Keck, 10 meters

Person

Myall, 4 meters

The

End