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That's a mountain or even a crater edge that's rising up from beyond the illuminated horizon, catching the sun's rays before the rest of the surroundings do. If you slowly scan the Moon's terminator, you'll find dozens of these, & over there course of a couple of hours they will be seen to change as the sun creeps over the lunarscape.
I'm looking at that "light" that you mention now. If you look closely, you'll see some smaller dots surounding that "light". These are other highland spots catching the sun's rays.
Mental.
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