Landsat at 40: Images from the longest-running eye in the sky
The first Landsat satellite went into orbit 40 years ago today, and during the past four decades, a series of seven different "birds" have trained a watchful eye on Earth from just about the most wicked vantage point around.
The program's youngest eye in the sky, Landsat 7, has been flying since 1999 and will be joined next year by the next-generation Landsat Data Continuity Mission satellite, or LDCM. The LDCM features up-to-date thermal infrared sensors and land-imaging equipment that will make it a full-blown orbiting observatory.… Read more