Final pre-launch preparations are underway for NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR. The mission, which will use X-ray vision to hunt for hidden black holes, is scheduled to launch no earlier than 13 June from Kwajalein Atoll in the Marshall Islands. The observatory will launch from the belly of Orbital Sciences Corporation's L-1011 "Stargazer" aircraft aboard the company's Pegasus rocket.

Source: NASA's NuSTAR gearing up for launch