The paper investigates the emergence of Majorana bound states (MBSs) in a hybrid InAs nanowire with epitaxial Al, using a quantum dot at the end of the nanowire as a spectrometer. By tuning the nanowire density with electrostatic gating, the authors observe the formation of MBSs from coalescing Andreev bound states (ABSs) in an applied axial magnetic field. In this topological phase, ABSs move to zero energy and remain there, forming MBSs. The authors also observe hybridization between the MBS and the end-dot bound state, which is consistent with numerical models. The ABS/MBS spectra provide parameters useful for understanding topological superconductivity in this system. The study highlights the potential of hybrid nanowire systems for realizing and studying MBSs, which are anticipated to exhibit non-Abelian exchange statistics and support fault-tolerant topological quantum computing.The paper investigates the emergence of Majorana bound states (MBSs) in a hybrid InAs nanowire with epitaxial Al, using a quantum dot at the end of the nanowire as a spectrometer. By tuning the nanowire density with electrostatic gating, the authors observe the formation of MBSs from coalescing Andreev bound states (ABSs) in an applied axial magnetic field. In this topological phase, ABSs move to zero energy and remain there, forming MBSs. The authors also observe hybridization between the MBS and the end-dot bound state, which is consistent with numerical models. The ABS/MBS spectra provide parameters useful for understanding topological superconductivity in this system. The study highlights the potential of hybrid nanowire systems for realizing and studying MBSs, which are anticipated to exhibit non-Abelian exchange statistics and support fault-tolerant topological quantum computing.