[93] These may possibly as an alternative evolve to some Wolf–Rayet star, characterised by spectra dominated by emission lines of things heavier than hydrogen, that have attained the surface due to powerful convection and powerful mass reduction, or from stripping from the outer levels.[94] The reflection nebula NGC 1999 is https://dallastomjf.arwebo.com/58590180/a-secret-weapon-for-hotel