Dark Energy survey delayed by, well, DARK ENERGY?
We awoke just after two in the afternoon to the eye-itching grogginess that inevitably follows a long night of observing. The afternoon light just barely peeked through the few windows in our dormitory rooms, located more than 60 meters (about 120 feet) below the Blanco Telescope, where we do our nightly work for the Dark Energy Survey(DES).
http://darkenergydetectives.org/2013/06/03/dark-skies-turned-gray-working-in-the-clouds/
Attenuation of Electromagnetic Radiation by Haze, Fog, Clouds and Rain.
http://www.rand.org/content/dam/rand/pubs/reports/2006/R1694.pdf
I’m just asking… 🙂

