Landsat-9 is new earth monitoring satellite launched by NASA on September 27. The first Landsat was launched in 1972 and since then, these satellites have collected images of the Earth for the better understanding of the land use changes over the decades. Their data were brought into public domain to be used for research and agriculture.
The new satellite will join Landsat 8, which was launched in 2013. Together, they will collect images of the Earth’s surface. It has two instruments aboard – Operational Land Imager 2 (OLI-2) and the Thermal Infrared Sensor 2 (TIRS-2) – for measuring different wavelengths of light reflecting off the surface of the Earth.


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