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Julian Smith's avatar

I would say it's an aircraft contrail lit from underneath by the setting sun.

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DavidB's avatar

Yes, that's a likely possibility.

Allen Versfeld (an astronomer) on Mastodon ruled out Mars, he also had a few other hypotheses, but isn't really sure:

https://mastodon.monoceros.co.za/@uastronomer/111318624113923944

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