are synthesized continuously, yes, they are there in in principle they can be, the same einstein and fermatthey are in the broad sense of understanding nature in the universe, they are, but we do not find them on earth, we do not find them, because on earth we can find those elements or those isotopes of these elements that are either stable, or those that live, uh, do not decay long enough to survive on earth, let me remind you that the earth in general in the solar system is about... 45 billion years old, and those elements that live billions of years longer, they are on earth, that's it uranium, this is the last element, uranium 238, its half-life, also coincidentally, is 4.5 billion years, that is, on earth we still have half the original amount of uranium, well, as i understand it, to obtain it in nature is no longer a trivial task, just in case i will remind you where the elements come from... similarly, after the big bang we had hydrogen and a little helium, there was nothing else in particular, well, one to three, yes, for something heavier to appear, even a little heavier than hydr