>>318125It's unlikely that there is none other lifeform, but in this galaxy and at this very moment?
Let's be honest, it does not matter. It cost the energy that the sun produce in a day to send a probe to a star that is 100 year light away, and it will take 1000 years for the probe to get there.
Wherever there is life out there, inteligent or otherwise, it does not matter.