I thought it was evident that I made a "reduction to the absurd" to refute the claim that aliens have visited our earth


" one assumes a claim for the sake of argument and derives an absurd or ridiculous outcome, and then concludes that the original claim must have been wrong as it led to an absurd result "

I got started from scientific evidences ( the size of our galaxi)
I made some assumptions in favour of the claim but within the bounds of the physical laws ( the level of technology )
I got an absurd scenario

Honestly I thought it was so obvious