20.6 degrees

It will take several weeks for the Link spacecraft to rendezvous with NASA’s Swift observatory.

Northrop Grumman's L-1011 carrier aircraft and the Pegasus XL rocket take off from Mojave Air and Space Port in California to begin the next leg of its journey to Kwajalein Atoll in the equatorial Pacific Ocean.

Northrop Grumman

High above the remote Pacific Ocean, about halfway between Hawaii and the northernmost part of Australia, an air-launched rocket fired into space on Independence Day weekend to kick off a weekslong pursuit of a NASA astronomy satellite perilously close to falling out of orbit.