One analogy I like is to imagine our scientific knowledge as on a land map. We have a large sheet of all there is to know. There is a small area in the middle

One analogy I like is to imagine our scientific knowledge as on a land map. We have a large sheet of all there is to know. There is a small area in the middle that is mapped, that's what we know, it is surrounded by blank space, that's what we don't know. As we explore further, the small area expands, but by doing so, its border also expands, meaning that the more we know, the more unknown we are exposed to. We expanded the area a little on the tardigrade side, so as expected, it revealed more areas to explore than what we discovered. As a general rule, science more often expands our borders than fills up holes, meaning that the more we know, the more we realize the extent of what we don't know.