Landsat 7 was launched in 1999. Had the Scan Line Corrector failure [1] in 2003 and has been taking striped images since then.
Landsat 8 is the recent addition launched in February 2013. Here you can see sample images from the satellite [2] and a side-by-side comparison to Landsat 7 [3].
Landsat 8 is the recent addition launched in February 2013. Here you can see sample images from the satellite [2] and a side-by-side comparison to Landsat 7 [3].
[1] http://en.wikipedia.org/wiki/Landsat_7#Scan_Line_Corrector_f...
[2] http://landsat.usgs.gov/LDCM_Image_Examples.php
[3] http://landsat.usgs.gov/LDCM_Underfly_with_Landsat_7.php