MISR Records the View as NASA's Terra Satellite Passes Its 100,000th Orbit On Oct. 6, 2018, NASA's Terra satellite became one of a handful of NASA satellite ever to complete 100,000 orbits. Launched in 1999, Terra and its five scientific instruments were originally slated to last six years. More than 18 years later, the Multi-angle Imaging SpectroRadiometer (MISR), built by NASA's Jet Propulsion Laboratory in Pasadena, California, and other instruments on Terra are still collecting data and are expected to continue into the 2020s, limited only by the amount of fuel in the spacecraft. MISR carries nine cameras that view the sunlit Earth simultaneously at widely spaced angles, providing global coverage with high spatial detail. The left image shows dusk falling over snowy Queen Maud Land, Antarctica, at the end of orbit 99,999, as captured by MISR's 70-degree backward-looking camera. On the right is MISR's first view from orbit 100,000, taken by its 70-degree forward-looking camera as sunrise illuminated clouds over the Kara Sea, north of Siberia. Over the years, researchers have used MISR's observations to construct a variety of global data sets that have advanced our understanding of Earth. These include the heights of clouds and wildfire smoke, the amounts of dangerous pollutants in the atmosphere, the movements of global wind systems, and the health of vegetation. The instrument remains as healthy as it was in 1999. https://photojournal.jpl.nasa.gov/catalog/PIA22836
