She keeps it undetected Except for occasional silent tugs and pulls Upon the large things in her universe. Does it stream through your hair like the solar wind Sparkling and glowing upon your brow with aurora, Or emanate the blue of your lowest mood A Cherenkov glow As the unbreakable light-speed barrier is surpassed In the medium of your blood-filled heart?
The dark stuff is everywhere and nowhere. Never seen before by science You hold it deep within you Sheltered from prying eyes Or hungry Nobel-seeking hands Or the silent sentinel listeners Of the radio telescopes.
She gathers more now, Until her fragile, silk-over-bone frame Fills with swirling black axions Until they spill out of her eye sockets Like the streaks of wet mascara. She tugs and pulls at us all, The em-ones and em-twos are unknown But not the universal constant Between human hearts.
I'll leave the physics to the reader to discover. Wikipedia is your friend.