Because neutrinos are uncharged, not affected by electromagnetic force, have almost zero mass, and are almost unaffected by gravity (and the gravity itself is extremely weak, accounting for only 10^-40 of the four major forces, it is basically It cannot catch neutrinos) and does not participate in the strong force at all. It is not affected by hadrons, the main particles in the universe, and moves at almost the speed of light, so there is almost nothing that can block neutrinos.
To detect (block) neutrinos, a neutrino detector needs to be placed deep underground or in the Antarctic ice, so that trace neutrinos can be captured (blocked)
Positive and negative neutrinos - model diagram
There are three generations of neutrinos oscillating. The three generations of neutrinos change each other (that is, oscillate) in the space and time of the universe. Sometimes the first generation becomes the second generation, and the third generation changes to the second generation. The second generation becomes the third generation.
Three generations of neutrinos - model diagram
The +- sign in the diagram represents the indivisible smallest unit of positive and negative electromagnetic information - quantum bit (qubit)
(Famous physicist John Wheeler John Wheeler once said a famous saying: Everything comes from bit It from bit
After the rise of quantum information research, this concept was sublimated to, everything comes from qubit)
Note: Bit is bit
According to historical records, Liu Beiyou has three sons, Liu Chan Liu Yong and Liu Li (he has three sons, and one Liu Feng, who was adopted after returning