This is from Sasha Sagan, daughter of Ann Druyan and Carl Sagan, remembering a time from her childhood when she began to understand mortality. Her parents told her:
“You are alive right this second. That is an amazing thing,” they told me. When you consider the nearly infinite number of forks in the road that lead to any single person being born, they said, you must be grateful that you’re you at this very second. Think of the enormous number of potential alternate universes where, for example, your great-great-grandparents never meet and you never come to be. Moreover, you have the pleasure of living on a planet where you have evolved to breathe the air, drink the water, and love the warmth of the closest star. You’re connected to the generations through DNA — and, even farther back, to the universe, because every cell in your body was cooked in the hearts of stars. We are star stuff, my dad famously said, and he made me feel that way.
My parents taught me that even though it’s not forever — because it’s not forever — being alive is a profoundly beautiful thing for which each of us should feel deeply grateful. If we lived forever it would not be so amazing.”
She characterized her father’s outlook on the world as a “form of joyful skepticism” that saw the grandeur in a scientific perspective. I’ve conveyed these exact sentiments to my own kids, usually when I’m taking them to or from school, that there were many chances for us not to exist. Yet here we are. How amazing is that? And they get it. Life is indeed beautiful.
Patrick F. Clarkin, Ph.D. 
My younger son once tried to use Sagan’s words to tell his teacher and classmates that he was made of “star stuff.” Instead, he phrased it as “my body is made of stars.” They didn’t quite get what he meant, but I think he did a good job.
To speak Boasian, your son and Moby independently innovated the phrase. (Embarrassingly, it had not until now occurred to me what the song was referencing.)
Maybe he has a future as a lyricist.
It’s a fine calling. Without music life would not be worth living.