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Today’s post takes us back, once more, to Ultima Thule/2014 MU69, the distant snowman shaped planetoid at the edge of the solar system which was visited by the New Horizons space probe as it flies through the Kuiper Belt on its way out of the solar system (since that time, we also blogged about the color Thulian pink–which is based on the fantasy land at the northern edge of the medieval map). Well, space can be a confusing place, and, even with digital cameras, the way we see objects tumbling through the void can be misleading. As New Horizons flew away from Ultima Thule, it turned its cameras around and took the following shot (which hopefully shows up in all of its glory as an animated gif below).
Holy hemispheres! What is with that bright edge? Spheres certainly don’t have those! It turns out that Ultima Thule may not be a snowman as originally billed. Instead it seems more like a double pancake.
This news will please flat earthers (on the off chance they believe that New Horizons actually exists), but they shouldn’t read too much into it. Planets are spherical because they are so massive that the force of gravity causes them to collapse into the most efficient shape – a sphere. This is broadly true for objects with a diameter greater than 1000 kilometers (621 miles) and Ultima Thule was not even remotely that big (indeed we didn’t think it was a sphere before). I do wonder how these two smushed snowballs formed and came together though.
Enthusiasts of Kuiper Belt objects will have to discard the snowman analogy and look for an object which is a lumpy disk stuck to a smaller lumpy disk. It sounds like a hogchoker to me (see a picture of the flatfish below), but this may merely be a shallow pretext to link to my flounder art on Instagram. It might be a while before we discover anything even remotely shaped like a flatfish in space though so I am going to take what the universe offers. If you have better topological analogies feel free to share in the comments (after you follow my Instagram).
ferrebeekeeper 