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A method for effectively generating long-lived Mossbauer photons and methods for proving the associated Mossbauer effects are reported. For the first time, we observed resonant propagation and resonant absorption of 40-keV Mossbauer photons emitted from 103Rh through (γ,γ′) process excited by bremsstrahlung. This is a new efficient way to generate long-lived isomer (＞ 1 ms) for Mossbauer spectroscopy with sufficient brilliance.An abnormally large ratio of resonant absorption between horizontal and vertical directions indicates horizontal trapping of Mossbauer photons and anisotropic Mossbauer emission, which can be attributed to gravitational effect on the 103Rh Mossbauer isomer with extremely narrow 10-19 eV linewidth.