This site is moving to www.usgs.gov/landsat.  Please visit the new site and update any bookmarks you have. 
 

Question:

Why are some browse images black?

Answer:

Black browse images are night (ascending) scenes, which are occasionally acquired for rows 123 to 246. Black scenes with a bright oval (candle flame) are Partial Aperture Calibration (PAC) scenes, also acquired during the ascending node.