There could be millions of planets with life or there could only be a few.
We may never know
What a GREAT question ! You go to the head of the class.
By the time science finds out about something its usually,
forty or fifty years later that the public hears about.
All planetary bodies are inhabited with there own version of life.
Not life as humans will call life, but life just the same.
That's just like us. Finding planets to colonize one day and then f'ing those planets up too.