Roman Space Telescope, NASA’s next ‘great observatory,’ poised for Sunday launch

Using a donated Hubble-class mirror originally built for a spy satellite, NASA's Roman Space Telescope is poised for launch Sunday on a $4.3 billion mission to open a new window on the universe. Liftoff from the Kennedy Space Center atop a SpaceX Falcon Heavy is scheduled for 7:26 a.m. EDT (1126 UTC).