they dont have an anwer yet
Because we live on earth and there is no life anywhere else.
None (intelligent or otherwise) has been positively identified except on Earth.
As far as what we know today, there is no life on any planet anywhere, except the Earth.
Life has not been found anywhere else so far
Rain forests.
If Earth and solar system didn't exist, no life would be there. Humans can't survive anywhere else.
Because if an extremophile can survive in such harsh conditions on Earth, why cant it survive anywhere else?
Earth is the only planet known to have life on it, however with the vastness of space the likelihood of life not existing anywhere else is astronomically low. We just havent found it yet.
Alien, is the term used to refer to life which does not originate from Earth. Though no hard evidence has ever been found to confirm presence of any life form outside earth.
According to the story; all life on earth died in the flood, except for those in the ark.
There are currently no indications that life exists on Jupiter (or anywhere else but Earth, for that matter). It is possible, however, that our instruments are not sensitive enough or we have not been looking in the right places.
Life has been found just about anywhere on Earth.