Little did they anticipate that Galileo would use the same instrument to discover the moons of Jupiter. The gamma ray instruments developed by the US to search for thermonuclear explosions in the Soviet Union discovered the still enigmatic gamma ray bursts. Stories like these are associated with each wavelength of light. Perhaps the most dramatic is the accidental discovery of the cosmic photon background with apparatus meant to study sky-interference with telephone communications. Although nothing can be guaranteed, history is on our side.
Neutrinos are particles associated with radioactive phenomena.
They are also produced in the decays of elementary particles such as pions. They have no electric charge and, as far we know, no mass. Their existence was postulated by Pauli as a book-keeping device to conserve energy and momentum in the radioactive decays of nuclei. Clyde Cowan and Fred Reines proved him wrong 23 years later. The problem is that interactions of neutrinos with matter are extremely feeble.