On Jan. 27, 2018, the students of Earth to Sky Calculus flew a payload-full of moonstone pendants to the stratosphere, 35.1 km (115,158 feet) above Earth's surface. Hand-crafted in the shape of a Celtic love knot, the sterling silver pendants were carried aloft by a helium-filled space weather balloon alongside an array of cosmic ray sensors. A waxing Blue Moon appeared frequently behind the floating pendant, adding its luster to that of the moonstone. After the balloon exploded, as planned, the payload parachuted back to Earth, landing in the Owen's Valley beneath the towering Sierra Nevada mountains of central California.
Each premium pendant comes with a greeting card showing the jewelry in flight and telling the story of its journey to the edge of space. Sales of this pendant support the Earth to Sky Calculus cosmic ray ballooning program and hands-on STEM research.