most of these are aliens actually
Not really big, slowly blinking and regularly burning my retinas
They forgot “is it followed by a bright flash and mushroom clouds?” → nuke, so grab some whiskey and make your peace because you’re probably too close.
Where’s ufo? /s
What about auroras? Not /s
What if Alexander Gerst is waving a flashlight at me from his boat in a downward u motion?
This flowchart is missing “Swamp gas from a weather balloon was trapped in a thermal pocket, and refracted light from Venus”
Is “fireball” a technical term here? Because I only know the wizard kind and they do end in a dramatic explosion.
“Fireballs and bolides are astronomical terms for exceptionally bright meteors that are spectacular enough to to be seen over a very wide area. … A fireball is an unusually bright meteor that reaches a visual magnitude of -3 or brighter when seen at the observer’s zenith. … Fireballs that explode in the atmosphere are technically referred to as bolides although the terms fireballs and bolides are often used interchangeably.”
Oh wow, impressive!