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.

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.

Where's ufo? /s

most of these are aliens actually

What if Alexander Gerst is waving a flashlight at me from his boat in a downward u motion?

Not really big, slowly blinking and regularly burning my retinas

I don't know if this is real or a joke meme. The blinking bit makes it sound real for identifying.

And what does it mean by boat?

SNe?

What if it's big and moving? And burning my retina too ?

They forgot scrap parts.

WOW, you learn something new every day, who thought that this thing that burns your retina or cook english turists in the Beach, is the Sun?