The Return of Halleys Comet And Popular Apprehensions
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These facts make it self-evident that there can be no danger of the comet's tail setting fire to the earth or its atmosphere even if the comet's head consisted of glowing gases at the time of perihelion passage, and these gases streamed out in the tail first, because they would be cooled down very much by expansion before they reached us; and secondly, because the small quantity encountered by the earth could do it no harm, even if it were incandescent. But the present comet will never get even... as close as 54, 000, 000 miles to the surface of the sun (perihelion distance 0. 589), and as its nearest approach to the earth will take place a full month after perihelion passage, still less is to be feared.
But what about the gases constituting the tail and their effect upon life? It was mentioned as probable that cyanogen forms a constituent part of comets. Now cyanogen (C 2 N 2 ) * s a poisonous gas! This looks serious enough; but happily it is by no means as bad as it appears. Assuming, but not granting, that the tail is formed of gas, or other ponderable matter ejected by the head, some cyanogen, if such is present, would no doubt be picked up by the earth and remain in the atmos- phere.
What to read after The Return of Halleys Comet And Popular Apprehensions?
You can find similar books in the "Read Also" column, or choose other free books by Philippines Weather Bureau to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
These facts make it self-evident that there can be no danger of the comet's tail setting fire to the earth or its atmosphere even if the comet's head consisted of glowing gases at the time of perihelion passage, and these gases streamed out in the tail first, because they would be cooled down very much by expansion before they reached us; and secondly, because the small quantity encountered by the earth could do it no harm, even if it were incandescent. But the present comet will never get even... as close as 54, 000, 000 miles to the surface of the sun (perihelion distance 0. 589), and as its nearest approach to the earth will take place a full month after perihelion passage, still less is to be feared.
But what about the gases constituting the tail and their effect upon life? It was mentioned as probable that cyanogen forms a constituent part of comets. Now cyanogen (C 2 N 2 ) * s a poisonous gas! This looks serious enough; but happily it is by no means as bad as it appears. Assuming, but not granting, that the tail is formed of gas, or other ponderable matter ejected by the head, some cyanogen, if such is present, would no doubt be picked up by the earth and remain in the atmos- phere.
What to read after The Return of Halleys Comet And Popular Apprehensions?
You can find similar books in the "Read Also" column, or choose other free books by Philippines Weather Bureau to read onlineMoreLess
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