It's a single photo of the entire earth from space. 121 megapixels is good, but it's only 10x the 12 megapixel sensor of my current camera. It's good, but it's not Gigapixel good. However, it is the highest resolution single photo that contains the whole earth in it. You can find better ones that are stitched together, but none that are a single image from a single instance in time.
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