SLAC Today is available online at:

In this issue:
Dark Matter Observed
Safety Today: Tunnel Rescue Drill
Blood Drive Wednesday

SLAC Today

Tuesday - August 22, 2006

In this image, dark matter (blue) has become separated from luminous matter (red) in the bullet cluster. Image courtesy of Chandra X-ray Observatory. (Click on image for larger version.) A visualization of the event is available here, courtesy of John Wise of the Kavli Institute for Particle Astrophysics
and Cosmology.

Dark Matter Observed

Dark matter, the elusive stuff that makes up a quarter of the universe, has been seen in isolation for the first time. Marusa Bradac of the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), located at the Department of Energy’s Stanford Linear Accelerator Center (SLAC), and her colleagues made the landmark observations by studying a galaxy cluster 3 billion light years away.

"We had predicted the existence of dark matter for decades, but now we've seen it in action," said Bradac. "This is groundbreaking."

Dark matter is fundamentally different from normal matter. It is invisible using modern telescopes because it gives off no light or heat, and it appears to interact with other matter only gravitationally. In contrast, luminous matter is everything commonly associated with the universe: the galaxies, stars, gas and planets. Read more...

(Column - Safety Today)

Tunnel Rescue Drills

On August 28-30, SLAC's emergency personnel will work with the Palo Alto Fire Department (PAFD) to coordinate a series of tunnel rescue drills that will involve all fire department shifts at SLAC.

On the days of the drill, fire engines and other rescue equipment will be responding to these simulated events. SLAC personnel and visitors should be aware that there will be uniformed rescue people on site responding to emergency sirens.

The drills, which will simulate the rescue of injured persons, will take place in the South Arc Tunnel.

View the Incident Action Plan and learn more about the drills at the ES&H website.

If you have any questions about the drills or concerns about events happening that day, please contact the SLAC Fire Marshal, Robert Reek.

Blood Drive Wednesday

(Logo)SLAC will host a blood drive in the Panofsky Auditorium Lobby Wednesday from 8:00 a.m. until 3:00 p.m. This drive is open to all members of the SLAC community and the general public.

Each hour, one random donor will receive a gift certificate for four AMC movie tickets, as well as candy, popcorn and a drink.

To donate blood, you must:
- Be at least 17 years of age
- Weigh at least 110 pounds
- Be feeling healthy
- Be well hydrated
- Eat before donation

To schedule an appointment online, log onto the Stanford Blood Center website and click on "Find a Mobile." Below the list of cities, next to "Search by Sponsor Code," enter SLA5323. Enter your email address and date of birth, and then follow the prompts to schedule your appointment.

Appointments will be given priority, but walk-ins are welcome!

Please contact Lauren Barbieri with questions.

Events (see all | submit)

Access (see all)

(see all | submit)

 Lab Announcements

Community Bulletin Board

News (see all | submit)

dividing line
(Office of Science/U.S. DOE Logo)

View online at