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Mirror symmetry is a plausible candidate for a fundamental symmetry ofparticle interactions which can be exactly conserved if a set of mirrorparticles exist. The properties of the mirror particles seem to provide anexcellent candidate to explain the inferred dark matter of the Universe andmight also be responsible for a variety of other puzzles in particle physics,astrophysics, meteoritics and planetary science. One such puzzle -- theorthopositronium lifetime problem -- can be explained if there is a smallkinetic mixing of ordinary and mirror photons. We show that this kinetic mixingimplies the existence of ordinary atom - mirror atom bound states withinteresting terrestrial and astrophysical implications. We suggest thatsensitive mass spectroscopic studies of ordinary samples containing heavyelements such as lead might reveal the presence of these bound states, as theywould appear as anomalously heavy elements. In addition to the effects ofsingle mirror atoms, collective effects from embedded fragments of mirrormatter (such as mirror iron microparticles) are also possible. We speculatethat such mirror matter fragments might explain a mysterious UV photon burstobserved coming from a laser irradiated lead target in a recent experiment.Comment: about 8 pages, couple of change

Ordinary atom–mirror-atom bound states: A new window on the mirror world