If you have an informed guess or even better, I'm all ears.
I would say it's an aircraft contrail lit from underneath by the setting sun.
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
I would say it's an aircraft contrail lit from underneath by the setting sun.
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