On this issue, I take a humanitarian-solipsist stance.
Roughly, I can formulate it as, since we are the centers of our subjective existences, our human values are, in fact, the ultimate values as far as our subjective experiences are concerned. Other paths lead to despair and nihilism.
Why would I value some billion year old dust over my own spiritual conceptions of meaning?
Beside the cosmic scale, I take this stance on every day, human scale as well. For example, some Hollywood pop star or some tech CEO will have more recognition, praise, money, fame, etc., than a scientist or philosopher writing a seminal work that lasts through the ages. If you take an "ultimate" or "global" stance, you have to accept that in the universal scale, the pop star is more "important" than the scholar. I refuse to accept this stance, and decide to value things on my own scale.
Not only is there an "objective" or "divine" scale of importance than mere circumstantial popularity or mass or scale or wealth or whatever other material metric you choose, but I am also free to define for myself what's important or not.
The galaxy isn't as important as us because we're the only ones in it (as far as we know) who can do mathematics. The pop star is not as important as the scholar because philosophy and science are more important than pop-music. I, personally, decide that humanity is more important than a bunch of ancient star-dust and space rocks because who's going to object? Not the star-dust and rocks, that's for sure, they can't talk. So fuck em.
t. big dick own meaning decider.