Quote:
Originally Posted by Snuffleupagus
I wish I could find it now but a few years ago I listened to a podcast where a doctor argued this, essentially he said the sheer impossible distances to travel here, the incredible amount of energy needed for this travel and questions on how did they find our little planet in the first place, but his best argument was that life on earth are a product of this planet so what are the chances that another living being from another planet have exactly the same makeup of gravity and air that we humans evolved from in order to survive?, if they came from a planet with 2X the size their body's would go to crap in hurry in our gravity and same goes for if their planet was .5 of our size, and what are the chances their planet has a 80% nitrogen and 20% percent oxygen makeup in order to breathe. He didn't really say he thought UFO's were from the future but he said it's more believable than interstellar aliens.
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Presumably, if an alien race was intelligent enough to overcome the hurdles to explore space, they would also have the ability to determine what the conditions on Earth would be like, and could genetically modify themselves adequately to survive the conditions.