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SUMMARY:Measuring the Expansion of the Universe - Wendy Freedman\, Observa
 tories of the Carnegie Institution of Washington
DTSTART:20091008T153000Z
DTEND:20091008T163000Z
UID:TALK19291@talks.cam.ac.uk
CONTACT:scott chapman
DESCRIPTION:Cosmology is at an interesting juncture. In the past century\,
  astronomers\nobtained the first complete census of the mass and energy in
  the universe. We\nlearned that the universe is composed of about one thir
 d matter\, while two\nthirds is in a new mysterious form that astronomers 
 refer to as dark energy.\nThis dark energy is causing the universe to acce
 lerate in its expansion.  I\nwill discuss measurements of cosmological par
 ameters\, with particular focus on\nmeasurements of the dark energy and th
 e Hubble constant\, the current expansion\nrate of the universe. I will gi
 ve an update on the status of the Carnegie\nSupernova Program\, a long-ter
 m project to follow up type I supernovae with\nphotometry at many waveleng
 ths and spectroscopy out to redshifts of 0.7.\nFinally\, I will discuss a 
 new project to improve the accuracy of the Hubble\nconstant based on new m
 id-infrared measurements of distances using the Spitzer\nsatellite. \n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4:00 pm)
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