The Bruce Murray Space Image Library
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NASA / JPL / USGS
Here is an absolutely enormous version of the mosaic in PNG format, at a resolution of 64 pixels per degree (23040x11520 pixels).
This and other global data sets are available from the USGS Astrogeology website.
There is a new Viking color global mosaic available as of January 2014.
Most NASA images are in the public domain. Reuse of this image is governed by NASA's image use policy.
Original image data dated on or about August 7, 1980
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