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Old 09-12-2019, 08:59 PM
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Sunny Daze is offline
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Join Date: Feb 2014
Location: Bay Area Urban Sprawl
Posts: 12,825
OK, I have some options for you:

-Meteor: they can be different colors as they move through the atmosphere, and some of them even change colors; depending on the angle relative to you, it could look like it was in the same approximate place for a long time
-Arcing: apparently power lines can produce blue or green light flares
-Star: many stars flash in different colors, even alternating; they can be magnified by the atmosphere and appear brighter
-Government stuff: This is a pretty cool example of the sort of things governments get up to in their spare time.
-Airplane: It could have been a conventional aircraft.
-Weather: thunderclouds can create all sorts of unique effects, including plasma, also ball lightning
-Geographical phenomena: earthquakes/earth movement can create lights