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DescriptionOpportunity rover's landing site.jpg
English: This image shows the abundance and location of the mineral grey hematite at the Opportunity rover's landing site, Meridiani Planum, Mars. Grey hematite is an iron oxide mineral that typically forms in the presence of liquid water.
The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]