As a child, I was tasked with chores to help keep the house in order, none of which I dreaded more than dusting. It seemed a Sisyphean punishment - tenacious, sneeze-inducing; dust always returned no matter how hard I tried to eradicate it. But it was also mysterious - grey anonymous matter, seemingly sprung from nowhere. I would later learn that dust comprises minuscule bits of dirt, soot, pollen, fabric, dander…and heavenly bodies. That’s right - terrestrial dust is partly cosmic.