One of the arguments for Oumuamua being more than just a "rock" was its detected dimension. If I recall correctly, it was very long and skinny and thus not very

One of the arguments for Oumuamua being more than just a "rock" was its detected dimension. If I recall correctly, it was very long and skinny and thus not very rock-like in a traditional sense. I think Avi Loeb put forth the idea that structurally an object like this could be a a piece of space junk. Maybe a piece of a space ship that would be able to be held together while spinning even with a long and skinny dimension. You'd imagine less stable pieces of rock to collapse into themselves and become more sphere like. Oumuamua was potentially a long skinny object that had been spinning around through the universe for a very long time.