Hubble Space Telescope Public Lecture Series
at the
Space Telescope Science Institute


Speaker: Benne Holwerda, Space Telescope Science Institute

Topic: Dust Grains in Island Universes

Date: March 6, 2007

Time: 8 PM

Place: Space Telescope Science Institute (STScI) Auditorium

Price: Free admission and free parking

Phone: 410-338-4700

Internet: http://hubblesite.org/about_us/public-talks.shtml


Our Milky Way Galaxy is outlined not only by the countless
stars in the night sky, but also by dark lanes where
stars are strikingly few. These dark regions are dust clouds
in our galaxy that dim, redden, and even block out the light
from stars behind them. In a similar manner, dust clouds
in a nearby galaxy will block light coming from more distant
galaxies. Dr. Holwerda will present his research that uses
the number of background galaxies in Hubble images to measure
the dust in a foreground spiral galaxies. Like Sherlock Holmes'
observation about the dog who didn't bark, this is an
investigation of the galaxies that don't shine.


Lectures on a diverse selection of cosmic topics are held
the first Tuesday of every month at 8 PM in the STScI
Auditorium, located at 3700 San Martin Drive on the Homewood
campus of Johns Hopkins University. Admission is free and free
parking is available in the lot across the street.

This lecture will be webcast live. The recorded webcast will
also be available for viewing online the following day. To
view the webcast, you may need to download and install
software. See the web site listed below in advance for
details.

Further information and directions are available by
calling 410-338-4700 or on the internet at:

http://hubblesite.org/about_us/public-talks.shtml