The Long Cloud on Mars: Why a New Feature Can Show an Old Image

Source checked 4 November 2026. NASA highlighted a 2018 image of the long cloud near Arsia Mons on 2 November. The image date and feature date describe different events.

Use the caption to identify when the image was captured and which spacecraft made the observation. A recently published image feature can explain something seen years earlier. That distinction matters when you compare it with a newly reported observation or track how often a feature appears.

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