A NASA official says some crews are working around the clock at the space agency's rocket factory in New Orleans to meet a fall 2020 test launch deadline for a mega-rocket designed to propel astronauts toward the moon and Mars. Another officer said he visited the Michoud Assembly Facility at midnight and people were working on the engine section for the 212-foot (65-meter) core of the Space Launch System. The other four sections have been assembled, and NASA says the rocket's core section is 80 percent complete.