9

Air & Space Smithsonian - - Soundings -

The Land­sat satel­lites have been watch­ing Earth for more than 40 years. Num­ber eight was launched in 2013, and NASA and the U.S. Ge­o­log­i­cal Sur­vey an­nounced in April they’ll keep the suite alive by start­ing work on Land­sat 9, to be launched in 2023.

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