[en] With regard to cosmological limits on the existence of possible stable heavy hadrons, it is considered what are the quantum numbers of the least massive hadrons which can be formed with the new quarks (stable quarks with lifetime on the scale of 4(10)⁹ years), the possible binding of these heavy new hadrons to single nucleons, forming a system analogous to the deuteron. The approximate binding energy of a new hadron to a heavy nucleus, possible predictions for the abundance of such objects, and what experiments would be most likely to reveal their presence and what are the current experimental limits on the abundance of such nuclei are also treated. 13 references