It may look like the surface of the moon, but the phenomenon captured in the video above is a little closer to Earth.
In fact, one ice physicist that the Times spoke too, Kenneth G. Libbrecht, says this may just be a world record, if anyone were keeping track of such things.
A drone video shows the gorgeous ice formation in all its glory, slowly rotating in what looks to be a slight bend in the river, with small eddies rolling by in the narrow passage not crowded out by the disk. The disk, which is formed by the water's currents is estimated to be about 100 yards across.
"There were ducks sitting on it", he said. "I think it will continue to gain in thickness as long as it keeps spinning", said Mitchell, adding that the massive saucer acted as a giant Lazy Susan for ducks that chose to investigate it.
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Added Zegler: "I am so thrilled to be playing the iconic role of Maria alongside this fantastic cast". Steven Spielberg has cast an unknown 17-year-old as Maria in his upcoming West Side Story remake .
Paul Nakroshis, an associate professor of physics at the University of Southern Maine, tells Maine Public Radio that the formation of the ice disks is not totally understood. "It was a big duck-go-round". They occur when "a pile of slush freezes in an eddy or a piece of ice breaks off from another and begins to rotate".
Researchers believe ice discs spin because of temperature changes in the water, creating a vortex underneath.
The disk appeared in the river on Monday and doesn't seem to be going anywhere.
The Press Herald reported the disk has caused "almost as much" interest in the city as a reptile nicknamed Wessie found devouring a beaver in the river in 2016.