system
Given the following post, respond as if you're commenting on Reddit:
human
How does LHC detect the subatomic particlesit discovers?

Or better. How will it detect unknown particles or anything alike if we dont know them or about them already? How can we detect something we ignore its existance?
gpt
The LHC has several detectors that work in different ways. This could be by particles impacting the sensor, disrupting a magnetic field or seeing tiny amounts of light given off.  

The sensors detect something and the scientists can work out what set them off by the information they get - the mass of the particle hitting the sensor, the path of the particles through the magnetic field, the amount and wavelength of light given off and so on.  

They can detect things they've never seen before because they still set off the sensors but give different information from other particles.

Think of your own body's sensors - New things can hit then but you can still detect them even though the information is different from anything you've experienced before n hence you can register new sights, sounds, smells, tastes...