Forbidden lines forbidden lines in astronomical spectroscopy bright emission lines in the spectra of certain nebulae h ii regions not observed in the laboratory spectra of the same gases because on earth the gases cannot be rarefied sufficiently the term forbidden is misleading a more accurate description. If there is any consistency in dutertes boastful words and braggadocio it is this his machiavellian approach to governance that he will not hesitate to kill people who cross the forbidden line of crime or get in the way of his initiatives on national discipline. Forbidden line is a challenging dazzling intellectual achievement its also a book about love and companionship a novel simultaneously touching and hilarious above everything else its a pleasure to read even if it makes you feel like youre on a careering train with all the stops . A forbidden line is an emission line found in the spectrum of a rarefied gas under special conditions such as those found in some nebulae the solar corona and parts of active galactic nucleialthough not seen on earth hence their name forbidden lines may account for 90 or more of the total visual brightness of an object such as a planetary nebula
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