Example image of eyePlorer eyePlorer map for 'Lyman-alpha line': Electron Hydrogen Hydrogen-like atom Lyman series Physics Principal quantum number Spectral line Frequency Ultraviolet Wavelength Fine structure Azimuthal quantum number Hamiltonian (quantum mechanics) Perturbation theory (quantum mechanics) Spin (physics) Spin–orbit interaction Moseley's law Bohr model Rydberg formula Lyman-alpha blob Timeline of knowledge about the interstellar and intergalactic medium USS Colonial (LSD-18) Orders of magnitude (frequency)