This was the last sunset - prior to several months of winter darkness - at Concordia Research Station in Antarctica. Scientists at the station are studying how living in extreme conditions affects the human body and mind.
It's what's called a reflection rainbow, which can be caused by sunlight beaming upward after reflecting from wet sand or calm water, in this case the water of Puget Sound.
Comet C/2019 Y4 (ATLAS) was getting brighter. Then, sadly, the Hubble Space Telescope caught it apparently disintegrating. Now ... surprise. Veteran comet observer Terry Lovejoy reported earlier today that the comet is brightening again!
Maybe you didn't realize Venus can appear as a crescent, much less in rainbow colors? These effects happen when Venus draws near its time of passing between us and the sun, which it will on June 3.