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Cosmic Cycles 2 Earth Our Home
Overview
Our home and the only planet we know of to possess life. In the years since we first managed to leave its atmosphere, our understanding of it has grown exponentially. NASA now observes and measures Earth with an unmatched fleet of spacecraft. Our influence on this incredibly complex and ever-changing sphere is both obvious and insignificant.
![The U.S. Department of Agriculture tracks how many acres and the annual yield for every crop produced. One method used to estimate crop acreage and yield is remote-sensing data from the NASA-USGS Landsat satellite program. The program started in 1997,with North Dakota, and by 2008 covered the entire lower 48 states and the District of Columbia. Music: "Downloading Landscapes" by Andrew Michael Britton [PRS] and David Stephen Goldsmith [PRS]. Published by Atmosphere Music Ltd [PRS].Complete transcript available.Watch this video on the NASA Goddard YouTube channel.](/vis/a010000/a013400/a013417/13417_Landsat_Croplands_print.jpg)
