Is There a Probability of Being the Only Life in the Milky Way?

It's possible to make a probability estimate of how likely it is that we are the only life on earth. We should be sending rovers and fliers, swimmers or whatever to all the other bodies in the solar system,. Another thing might be we really ought to understand the early biochemistry of earth better. And there some means dressing part of it, like the biochemistr of gank, random organic matter That could help us learn more about our place in the universe.