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It's impossible that none of those 900 trillion planets have life. Even if they are just little worm things or even just unicellular microbes. Aliens must exist.
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No not really. It is very possible for our own planet to be the only one that harbours life. "Life" itself may just be a spacial anomaly.
So to conclude, the possibilities are equal. The universe is either full of life, or dead. Both possibilities are just as probable as each other, since there is no good evidence supporting either.