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From left, Marie Lewis, NASA Communications, and Thomas Zurbuchen, associate administrator, NASA’s Science Mission Directorate, speak to members of the news media during a prelaunch news conference for NASA’s Landsat 9 mission at Vandenberg Space Force Base in California on Saturday, Sept. 25, 2021. Landsat 9 is scheduled to launch at 2:12 p.m. EDT (11:12 a.m. PDT) on Monday, Sept. 27, on a United Launch Alliance Atlas V 401 rocket from Space Launch Complex 3 at Vandenberg. The launch is managed by NASA’s Launch Services Program, based at the agency’s Kennedy Space Center in Florida. Landsat 9 will join its sister satellite, Landsat 8, in orbit in collecting images from across the planet every eight days. This calibrated data will continue the Landsat program’s critical role in monitoring the health of Earth and helping people manage essential resources, including crops, irrigation water, and forests.