Actualism of Extraterrestrial

Actualism is a widely-held view in the metaphysics of modality. To understand the thesis of actualism, consider the following example. Imagine a race of beings — call them ‘Aliens’ — that is very different from any life-form that exists anywhere in the universe; different enough, in fact, that no actually existing thing could have been an Alien, any more than a given gorilla could have been a fruitfly. Now, even though there are no Aliens, it seems intuitively the case that there could have been such things. After all, life might have evolved very differently than the way it did in fact. For example, if the fundamental physical constants or the laws of evolution had been slightly different, very different kinds of things might have existed. So in virtue of what is it true that there could have been Aliens when in fact there are none, and when, moreover, nothing that exists in fact could have been an Alien?

To answer this question, a philosopher should try to identify the special features of the world that are responsible for the truth of claims about what could have been the case. One group of philosophers, the possibilists, offers the following answer: ‘It is possible that there are Aliens’ is true because there are in fact individuals that could have been Aliens. At first blush, this might appear directly to contradict the premise that no existing thing could possibly have been an Alien. The possibilist's thesis, however, is that existence, or actuality, encompasses only a subset of the things that, in the broadest sense, are. Rather, in addition to things like us that actually exist, there are merely possible things — possible Aliens, for example — that could have existed, but, as it happens, do not. So there are such things, but they just happen to exhibit a rather less robust but nonetheless fully-fledged type of being than we do. For the possibilist, then, ‘It is possible that there are Aliens’ is true simply in virtue of the fact that there are possible-but-nonactual Aliens, i.e., things that could have existed (but do not) and that would have been Aliens if they had.

Actualists reject this answer; they deny that there are any nonactual individuals. Actualism is the philosophical position that everything there is — everything that can in any sense be said to be — exists, or is actual. Put another way, actualism denies that there is any kind of being beyond actual existence; to be is to exist, and to exist is to be actual. Actualism therefore stands in stark contrast to possibilism, which, as we've seen, takes the things there are to include possible but non-actual objects.

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