Source: USGS Landsat
All 8 million Landsat scenes are available to download from EarthExplorer, GloVis, and the LandsatLook Viewer.
As the world’s longest continuously acquired collection of space-based, moderate-resolution land remote sensing data, the USGS Landsat archive adds over 1,100 scenes each day.

Landsat Goes to the Library
Landsat made a solid showing at the annual ALA conference (considered “the world’s biggest library event”) in Washington, D.C. this month.