For decades, scientists have scavenged for mysterious the “ghost particles” known as neutrinos, which are subatomic particles with no mass and almost no electrical charge. Despite their elusive nature, ghost particles are theorized to be the most common matter particles in the universe, with trillions of the buggers passing through our bodies every second. Now, after ten years of construction, the Jiangmen Underground Neutrino Observatory (JUNO) in China is hoping for some breakthroughs of its own. JUNO is a spherical neutrino detector, a hulking 20,000-tonne orb nestled deep under the mountains of Kaiping in southern China. Early detectors only caught one type of neutrino, making it seem like most of the Sun’s particles had vanished.