How a satellite actually creates images of the Earth

On February 11, 2013, NASA's Earth-mapping Landsat 8 satellite was launched into our planet's orbit. To celebrate a year in space, Landsat team leader David Roy has used imagery acquired by the satellite to create a most unusual composite photograph of the United States: a patchwork of parallel strips, each one… » 2/12/14 3:20pm 2/12/14 3:20pm