what would cause a nebulae, in the milky way galaxy, to resemble a double
helix? a man maybe(not to be sexist)
or a cloud to resemble a lolly pop?
can we see anything we don’t try to associate with something we’ve see before?
How many nebulae are there in the universe? I’m sure at least one is bound to resemble something we’ve seen here on Earth. And when we actually notice this one specific occurence are we to assume that it is somehow related to us? Of course not.
*not a direct answer to your question, but something to consider when answering it.