Dark Matter Detector

 How do you detect something that is invisible ? This is what some of physicists from around the world were thinking about until they came up with Dark Matter Detector. One of them is located in SNOLAB, Ontario, Canada 2 km underground. Suspended in 345,000 litres of ultra pure water there's a sphere containing 3600 kg of liquid Argon cooled to -180 degrees Celcius. If our model of physics is correct, billions of dark matter particles are passing through the earth every second and we should be able to detect their interactions. These interactions are very rare and sensitive that's why the detector is placed 2 km underground so earth radiation is blocked from disrupting the data. If dark matter passes through the detector if leaves sings such as light particles or bubbles that are picked up by sensors around it. As of 2017 no dark matter particles have been detected but in the meantime engineer and physicists are developing more advanced detectors that could lead to finally detecting dark matter. 

source : https://www.youtube.com/watch?v=PxzNo58pE2c