Interstellar object 'Oumuamua is a pancake-shaped chunk of a Pluto-like planet

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'Oumuamua, the first known visitor from interstellar space, was likely a pancake-shaped chip off a Pluto-like world.

Interstellar object 'Oumuamua is a pancake-shaped chunk of a Pluto-like planet : Read more

 

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We have a name for objects flying in space that we cannot identify - Unidentified Flying Object. UFO.
We also have a name for things that fly and look like a pancake, which incidentally can be said to be saucer-shaped. And not, it not "flying flapjack" it's flying saucer.

So Oumuamua is a UFO flying saucer!