Nope, that's too mysterious to agree with, there is no life throughout the space.
That's a very bold statement. Have you been throughout the space to check for it? If not, then you say "I don't know". What you said is "there is no life throughout the space.", yet earth is in space. If you meant in outer space... well, see above. But agreeing with someone saying "aliens exist" is ill advised if
there's no concrete proof at hand. I can only say that if there's us, there's likely other life in other galaxies, but we haven't found it. But I am not making an absolute claim, because I do not know everything that constitutes life, and I haven't yet found another life-system, like or unlike our carbon-based one. So, it is a possibility, but claiming that THERE ARE ALIENS or that THERE ARE NO ALIENS is equally as ridiculous, seeing as how we haven't researched the subject at all (and by that I do not mean "How A Void sees alien research").
If yes, then it'd be just bacteria. Even if there is, we must have caught them up.
If there's bacteria, you can have multicellular life too, as we can see
Then again, there's no telling if there would even be such thing as a bacteria. Life as we know it might be only one tiny instance of what life CAN be, and by life I really mean self-replicating molecules, that's about as generic as I'd go, because it could be silicon based for all we know. There's no reason why a civilization, if it can exist, would have to be less advanced than ours. After all, our planet, and our whole solar system, are pretty young, there are solar systems way older than it.