19/08/2026
What if the key to understanding the Universe isn’t above us… but **2.4 kilometers beneath the Earth?** 🌌🔬
Deep beneath the Jinping Mountains in Sichuan, China, lies the **China Jinping Underground Laboratory (CJPL)** — one of the world’s deepest underground laboratories.
But why build a scientific laboratory beneath kilometers of solid rock?
The answer: **Cosmic Rays.** ☄️
High-energy particles constantly reach Earth from space, creating background signals that can interfere with extremely sensitive physics experiments. Deep underground, the enormous layer of rock acts as a natural shield, dramatically reducing this cosmic-ray background.
And that gives scientists something incredibly valuable — an ultra-quiet environment to search for some of the rarest signals in physics.
One of the biggest targets? **Dark Matter.** 🌑
Scientists have strong evidence that dark matter exists because of its gravitational effects, and it is thought to make up roughly **85% of the matter in the Universe** — yet its fundamental nature remains unknown.
Inside underground laboratories like CJPL, extremely sensitive detectors can operate for months or even years searching for extraordinarily rare particle interactions.
Scientists are also using deep-underground experiments to investigate neutrinos and other rare processes that could help us better understand fundamental physics and the Universe itself. ⚛️
While some humans travel **upward into space** to explore the cosmos… 🚀
others travel **deep beneath the Earth** to search for its biggest secrets.
Sometimes, to understand the Universe,
**you have to go underground.** 🌍✨
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