Balloon-borne astronomy experiment X-Calibur racing to hit wind window
Saturday, September 14, 2013 - 06:00
in Astronomy & Space
In a few days, a balloon-borne telescope sensitive to the polarization of high-energy "hard" X-rays will ascend to the edge of the atmosphere above Fort Sumner, N.M., to stare fixedly at black holes and other exotic astronomical objects.