On Aug. 19, 2019, the students of Earth to Sky Calculus launched a cosmic ray balloon to the edge of space. This white gold-plated pendant went along for the ride. The glittering Swarovski crystal at the heart of the pendant was inspired by the red-supergiant star Antares in Scorpio. The balloon flew 104,002 ft above the Sierra Nevada mountains of central California, experiencing temperatures as low as -63 C and cosmic ray fluxes 200x stronger than on the Earth below. After the helium balloon exploded (as planned), the payload parachuted back to Earth, landing in the volcanic tablelands north of Bishop, California. The students got great cosmic ray data, and the pendant was recovered safely from a field of volcanic rock nearly as red as the pendant itself.

Each 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.

The Antares Pendant