My sense is that it is a high-altitude cloud illuminated by the sun below the horizon. But I'm left with guessing since the article contains very little useful information.
I agree. In the 2 min. video you can see how the light slowly fades as the sun falls below the horizon.
My sense is that it is a high-altitude cloud illuminated by the sun below the horizon. But I’m left with guessing since the article contains very little useful information.
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I often can see rocket launches in the small town I live in. I am in South Carolina, and the launches are in Florida. 30 minutes after one launch, I witnessed a strange luminous cloud, appearing pretty stationary.
When a rocket is launched in Florida, it takes approximately 2 minutes for the rocket to reach 500,000 feet in altitude. I found this out by listening to the live launches while observing. That is the height at which I can begin to see the rocket from my town. And, even if the sun has set, I can see the rocket contrail.
The luminous cloud I saw, was the moon behind an extremely high rocket contrail! Even though it was quite dark, I observed a luminous cloud! This was a very strange sight on a dark night.
I realize the circumstances are different, but I would not rule out a high atmosphere cloud. There are not normally clouds at 500,000 feet, but a rocket contrail 30 minutes after dark can appear to be a luminous cloud.