/sci/ - Science & Math

The universe rarely does anything once. The fact that we exists means that the universe probably has life somewhere else as well.
It's more likely that multiple planets with life exist or no life exists than just one planet having life on it existing because for that to happen that means the chances of life existing have to be near equal to the amount of planets that exist and it's probably not close to that. So even without knowing the chances of life existing I can safely say that it is more likely that life exists more than once than just once.
That is the same logic that let us assume other stars have planets around them because our sun is a star and has a planet around it. Even though we didn't know how likely planets are for a star we knew that the chances of it happening exactly one were less likely than it happening multiple times.