Quote:
Originally Posted by loomberah
Did you actually see something moving across the face of the Moon, or only discover the mark when you looked at the photo? Do you have more than one photo showing it?
It is too large to be most satellites, maybe apart from ISS, but it doesn't look like that.
It looks exactly like a dust spot on a digital camera detector to me, I've had plenty of them over the years.
Gordon
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That's exactly what it looks like, a dust particle on the sensor.
You'll notice another "hair like" one in the upper right limb too.
Some keen amateurs use this same basic maths to work out how big the sensor dust actually is relative to their sensor.