Landsat images the Earth’s surface in a series of scenes 185 kilometers (115 miles) wide. Landsat 7 is currently collecting data, but suffered a failure in 2003 that leaves gaps between scan lines. This Landsat 7 image, collected on June 26, 2012, shows the Ouachita Mountains, along the border between Oklahoma and Arkansas. For more information, read Landsat Looks and Sees
Forty Years of Observations Reveal a Changing Planet and Society.