Neutrinos are subatomic particles that have a negligible mass and no electric charge. They are produced by various natural processes, such as nuclear reactions in the Sun, supernovae, and cosmic rays interacting with the Earth's atmosphere. Neutrinos interact with matter extremely weakly, which means they can pass through the human body and other solid objects without causing any noticeable effects.
The consequences of a neutrino hitting our body are essentially non-existent. Due to their extremely weak interactions, the vast majority of neutrinos passing through the body simply continue on their path unaffected, without interacting with or being absorbed by any atoms or molecules in our body. Neutrinos pass through matter so easily that billions of them pass through each square centimeter of our bodies every second without causing any harm.
As for the speed of neutrinos, they are known to travel at almost the speed of light. In experiments conducted to measure neutrino speed, neutrinos have been observed traveling at speeds indistinguishable from the speed of light. However, the precise speed of neutrinos is very close to but not exactly equal to the speed of light.
It's important to note that while neutrinos are harmless to humans due to their weak interactions, they play a crucial role in various areas of astrophysics, particle physics, and cosmology. Scientists study neutrinos to understand fundamental properties of particles and phenomena in the universe, such as the behavior of stars, supernovae, and the nature of matter itself.