UFO sightings

I have always believed that there is life beyond our planet. The simple mathematical explanation for this is simply that the universe is too big for there not to be. Even if there is only a one-in-a-billion chance that a planet in a given star system could produce and support life, the sheer number of star systems in the universe suggest that there are trillions of planets out there with life on them.

Besides, it's kind of, ummm... arrogant to think that we humans are so special that we are the only life in the entire universe.

"Life" does not necessarily have to mean a four-legged furry animal that breathes oxygen and drinks water, or that has a skeleton and a brain. The enormous variety of species within our own planet (on land and underwater) should dispel this notion.

So why is it that whenever NASA finds traces of water on Mars or Enceladus or wherever, the first suggestion is that life could exist on these planets? We assume that life requires water and oxygen. Couldn't lifeforms exist on other planets that are based on ammonia and methane instead?

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