Landsat program

The Landsat program is the longest-running enterprise that has acquired satellite imagery of Earth. It is a joint NASA / USGS program. On 23 July 1972, the Earth Resources Technology Satellite was launched.

This was eventually renamed to Landsat 1 in 1975.
The most recent, Landsat 9, was launched on 27 September 2021.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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