@ Hermes

During a meditation I had an insight (likely bogus and full of confirmation bias) in which the myth of the rainbow serpent  of indigenous Australian peoples was actually the tail of a comet as it entered our atmosphere at just  the right angle and time of day to refract enough sunlight to create a rainbow in the sky seen by many indigenous nations. The myth states the serpent shaped the landscape creating mountains and valleys and rivers - which is concurrent with an impact of sufficient proportion.