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Recent progress in laser and x-ray spectroscopy of muonic atoms offerspromising long-term possibilities at the intersection of atomic, nuclear andparticle physics. In muonic hydrogen, laser spectroscopy measurements willdetermine the ground-state hyperfine splitting (HFS) and additionally improvethe Lamb shift by a factor of 5. Precision spectroscopy with cryogenicmicrocalorimeters has the potential to significantly improve the charge radiiof the light nuclei in the $Z=3-8$ range. Complementary progress in precisionshould be achieved on the theory of nucleon- and nuclear-structure effects. Theimpact of this muonic-atom spectroscopy program will be amplified by theupcoming results from H and He$^+$ spectroscopy, simple molecules such asHD$^+$ and Penning trap measurements. In this broader context, one can testab-initio nuclear theories, bound-state QED for two- or three-body systems, anddetermine fundamental constants, such as the Rydberg ($R_\infty$) and thefine-structure ($\alpha$) constants.

Muonic-Atom Spectroscopy and Impact on Nuclear Structure and Precision QED Theory