👉 In physics, a protoneutron is a small subatomic particle that has been observed in a neutron star. The term "protoneutron" refers to a hypothetical or speculative concept where a neutron star has a neutron content of 10-13 kg (10-15 tons) and an electron content of 10-17 kg (10-20 tons). However, it is important to note that this concept is purely speculative as no such object has been
