“The solar reactor is weak and can synthesize mainly hydrogen and helium. According to B²FH and K²L models, the thorium can be synthesized in neutron stars (NS), which have a strong reactor. The nearest NS is RX J1856.5-3754, which is allocated at 167 pc from Sun. In the solar system was recorded 1 gram of thorium. How much of thorium has produced the NS donor-star?”