Video: How Stars Destroyed Almost All the Atoms in the Universe

Video: How Stars Destroyed Almost All the Atoms in the Universe

Credit: W.M. Keck Observatory

On Thursday, May 10, 2012, Keck Observatory hosted a live webcast of an astronomy talk by Dr. Brian Siana of the University of California at Riverside. Below is the recording of that talk, which was delivered to a live audience at the Kahilu Theatre in Kamuela-Waimea, Hawaii. 

The first galaxies had an extraordinary impact on the young universe. Their ultraviolet light destroyed nearly all of the atoms in the cosmos. This process, called reionization, had severe consequences for galaxies trying to form thereafter. Unfortunately, we have no idea how it happened. In galaxies today ultraviolet light cannot escape, so the first galaxies must have been very different from those we see today. Dr. Siana will describe the quest to detect these first galaxies and their impact on the early universe.

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MOSFIRE and NIRSPEC are the instruments tonight. Observers are from CIT and NASA. Sun set 06:33:00pm rise 06:00:00am
Tonight's schedule is MOSFIRE on Keck 1 and NIRSPEC on Keck 2 for our lucky observers from CIT and NASA. Sun set 06:33:00pm rise 06:00:00am
Keck 1 MOSFIRE is scheduled with CIT observers. Keck 2 NIRSPEC is scheduled for UCB observers. Sun set 06:36:00pm rise 05:59:00am
We are setting up HIRESR/PCS+SSC on Keck 1 for UCSC/KECK observers, NIRSPEC on Keck 2 for KECK observers. Sun set 06:37:00pm rise 05:59:00am
Do you know your address? Earth and Just Got a Few Trillion New Neighbors | W. M. Keck Observatory bit.ly/1wnG0cv