Landsat 9 and the Future of the Sustainable Land Imaging Program [Updated November 4, 2021] [open pdf - 2MB]
From the Introduction: "The National Aeronautics and Space Administration (NASA) launched Landsat 9, a remote sensing satellite NASA developed in partnership with the U.S. Geological Survey (USGS), on September 27, 2021. Landsat 9 is the latest in a series of Earth-observing satellites that began on July 23, 1972, with the launch of Earth Resources Technology Satellite 1, now known as Landsat 1. [...] This report describes the Sustainable Land Imaging Program, Landsat satellite instrumentation, uses of Landsat data, and aspects of Landsat's history. The report also discusses potential alternatives to the current Landsat satellite system and Sustainable Land Imaging Program, as well as possible tradeoffs among those alternatives."
CRS Report for Congress, R46560
Congressional Research Service: https://crsreports.congress.gov/