There is a planet in our solar system that scientist have identified as Planet 9. They haven’t seen it, but there is convincing evidence of its existence, based on the influence that the planet has on surrounding celestial bodies.
In short— Scientists are determining the existence of something they have not visibly seen, by observing the reaction that the object has on the things around it.
Human beings, like planets, are influenced by the things around us. It is easier to overlook the impact of things that are not visible– But, we can discover greater possibilities when we remember that everything moves in relationship to something else.
Sometimes, the things influencing us the most can not be seen. But, with the proper observation, we may be able to recognize their existence.