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Journal Kris_B_04's Journal: Existance of life != Water - Methane - Ozone 1

Why is it so important for certain chemicals to be present in order to discover "life"? I know Water is required for human existence, but why do scientists limit their searches for life on the foundation that all life must be carbon-based?

I mean, you always hear things such as:

"Scientists searching for signs of life beyond Earth are keen to learn about the presence of water on other planets -- both in and beyond our solar system -- because water is thought to be fundamental to the existence of life."

  Signs of water seen on planet outside solar system

The ideas of non-carbon-based life may push the realm of "science fiction" but even traveling to the moon was once "science fiction". It just bothers me that we may have witnessed life on another planet, but scientists were too dense to recognize it AS life.

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Existance of life != Water - Methane - Ozone

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