A grayscale image mosaic of Mercury's western limb, captured by the MESSENGER spacecraft. The image shows a contrast between old, heavily cratered terrain and smoother impact basins, possibly flooded by ancient lava flows. The smoother areas resemble the lunar maria. This highlights the volcanic activity in Mercury's past.

Astronomy Picture from 27/05/2009

Volcanic Terrain on Mercury

Source: https://apod.nasa.gov/apod/ap090527.html


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