NASA is restarting a mission with greater capability for
usinghigh-energy X-rays to detect black holes.  The Nuclear
Spectroscopic Telescope Array, or NuSTAR, is an X-ray telescope
designed to answer fundamental questions about the universe,
such as how black holes are distributed through the cosmos.
Funding pressures forced NASA cancel the NuSTAR mission in 2006,
but the restarted mission is expected to be up and running in
2011.  "NuSTAR has more than500 times the sensitivity of
previous instruments that detect black holes. It's a great
opportunity for us to explore an important astronomical
frontier," Alan Stern, associate administrator for the Science
MissionDirectorate at NASA Headquarters in Washington, said in a
release.  Black holes can't be seen directly because they're so
dense not even light can escape their pull. Instead, astronomers
use X-ray telescopes to detect the X-rays given off when objects
fall into black holes.  By focusing X-rays at higher energy,
NuSTAR will also answer questions such