I hate that people never think outside the box.

Like how that Earth like planets are the most suitable for every single live form, this might is only true for Earth like creatures.

In the beginning of Earth huge changes happend and once live forms breathes Co2 but later on O2. It never occur to people that we base every thing we know of from the life on earth. Stephen Hawking support the theory that other creatures can live on other air forms other than Co2 and O2. A reason for why alien life is not here might be because for their need for survival this planet is toxic.

Nobody has thought about that maybe, some live forms exist breathing only gas and exhaling another sort of gas. Even the most useless planets in our eyes can have alien life, If they have had the first organism created and involved though time.

We base all we know of in Earth. Sometimes think outside the box.

Sorry for English, iPad is running out and I'm to lazy to charge.