Watch live as Northrop Grumman launches its Antares rocket and Cygnus spacecraft on a resupply mission to the International Space Station.  Liftoff is targeted for 12:36 p.m. EST from NASA's Wallops Flight Facility in Virginia. The “S.S. Katherine Johnson” Cygnus spacecraft is named after Katherine Johnson, a NASA mathematician whose love of numbers helped send astronauts into Earth’s orbit and then to the Moon! This mission will bring with it 8,000 pounds of cargo including several technology development demonstrations, crew supplies, and vehicle hardware to the orbiting laboratory.