Oh come on, what a lot of crap. So our understanding of how tiny particles move in the upper atmosphere is so perfect that it's more likely we would find alien

Oh come on, what a lot of crap. So our understanding of how tiny particles move in the upper atmosphere is so perfect that it's more likely we would find alien bugs than be wrong about how particles move up there? I mean, we have a pretty good understanding of the millions of miles of vacuum separating us from any other world. It might be just a little harder for bug parts to escape the gravity well of another planet, travel through space, and then float around in our upper atmosphere than it would be for us to be slightly less than perfect in our understanding of how high the wind can blow little flakes of dust. In fact, assuming these aren't bugs that live in the vacuum of space, wouldn't they have had to pass through the upper atmosphere of wherever they came from before they could have then jumped to be floating around in space, so they could get here? I will now mock this in the form of a Holmes mystery: "So how did the Murder happen, Sherlock?" "Clearly the butler could not have used the car, as we know it did not have enough gas to make it to where the body was found. We also know that no other person was near enough to the crime to have committed the foul act." "But what could have happened my dear Holmes?" "Aliens from Neptune murdered this man." "You can imply the existence of aliens from a murder, fantastic... But Holmes, how could the aliens have moved the body?" "Elementary my dear Watson, they stole the key from the butler and used the car." "Astounding Holmes!" "How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?"