Of these seventeen billion only 1 billion are in the Goldilocks zone, that is neither too hot or too cold for life, of this 1 billion, only 1 million have H2O, water that is essential for life. Of these only 50 thousand have elementary life forms.
Of these only 10 have developed into conscious beings with an advanced technology. Of these 8 have self destructed with that technology usually with nuclear bombs, mihgreop bombs and phsyeewq bombs.
That leaves only 2. One of them is called Earth and the other is called Htsloop, but earthlings have not discovered it yet.