I'm trying to win an argument that it is impossible to be visited by aliens. During my argument, I changed that to routinely visited by aliens. As this is totally nonsense, how do I win the argument when my opponent constantly says, "you don't know what aliens are made out of or what they are like. Maybe they are made out of something we've never seen on Earth!".

So, I say... Lets take the closest star,Centauri, and aliens started the journey towards earth. Brought their own oxygen to burn fuel or had some sort of nuclear alien fusion to get here without oxygen. Even if their bodies were made out of stainless steel, they would burn up traveling at the speed of light. So, unless they were made of something tougher than the hardest metal on earth, and still amazingly breathed thru metal lungs, they could never make it at 186,000 mi/sec for 4.3 years.

I break it down more, that humans can withstand G forces at around 2100 mph and so. By the time a breathing alien reasonably flesh-like got to earth, we would be visited by his 3rd generation b/c it couldn't withstand the G-forces necessary to get here. Unable to crunch the numbers...

How do you explain to such earthlings that it's mathmatically impossible or what logic would you use?

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