In the Days of the Comet is a science fiction novel by H. G. Wells in which humanity is "e;exalted"e; when a comet causes "e;the nitrogen of the air, the old azote,"e; to "e;change out of itself"e; and become "e;a respirable gas, differing indeed from oxygen, but helping and sustaining its action, a bath of strength and healing for nerve and brain."e; The result: "e;The great Change has come for evermore, happiness and beauty are our atmosphere, there is peace on earth and good will to all men."e;