Breaking space news, the latest updates on rocket launches, skywatching events and more! You are now subscribed Your newsletter sign-up was successful Want to add more newsletters? The first mission of Northrop Grumman's big new cargo spacecraft is nearly over. That freighter, known as Cygnus XL, is scheduled to leave the International Space Station (ISS) on Thursday morning (March 12), ending a nearly six-month orbital stay. The departure is scheduled for 7:05 a.m. EDT (1105 GMT). You can watch it live here at Space.com, courtesy of NASA, or directly via the space agency. Coverage will begin at 6:45 a.m. EDT (1045 GMT). The Cygnus XL launched atop a SpaceX Falcon 9 rocket on Sept. 14, carrying about 11,000 pounds (4,990 kilograms) of scientific gear and other supplies toward the ISS. That big cargo load explains the new freighter's name: Earlier versions of Cygnus hauled about 8,500 pounds (3,856 kg) to the orbiting lab.…