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Updated: June 14, 2025
Comets nearly always have the finest tails, and present altogether the most beautiful appearance, immediately after they have been in the closest proximity to the sun. The comet's tail seems, in reality, to be a thin oblong case of vapour, formed out of the cometic substance by the increasing intensity of the sunshine, and enclosing the denser portion of that substance at one end.
Before anything was as yet known of the comet's path or velocity, he announced, from the position of the double sodium-line alone, that at 3 p.m. on September 18 it was increasing its distance from our planet by from 61 to 76 kilometres per second. M. Bigourdan's subsequent calculations showed that its actual swiftness of recession was at that moment 73 kilometres.
But the recent discovery that a number of comets are associated with meteoric matter, travelling in nearly the same orbits, suggests the inquiry whether an enormous meteorite following in the comet's train, and having a somewhat less perihelion distance, may not have been precipitated upon the sun, thus producing the great disturbance observed so shortly after the comet's perihelion passage.
Messier is also remarkable for the light streak, often said to resemble a comet's tail, which extends from the larger crater eastward to the shore of the Mare Fecunditatis. Goclenius and Guttemberg, on the highland between the Mare Fecunditatis and the Mare Nectaris, are intersected and surrounded by clefts, besides being remarkable for their broken and irregular though lofty walls.
Some look behind, as fiends pursued them there, And yet I see no shapes but the keen stars: Others, with burning eyes, lean forth, and drink With eager lips the wind of their own speed, As if the thing they loved fled on before, And now, even now, they clasped it. Their bright locks Stream like a comet's flashing hair: they all Sweep onward.
"Let friend Michael speak," said Barbican, with a smile, to the Captain; "we may learn something." "Certainly you may," continued the Frenchman, "if you have room for anything new. Were we not struck by a comet's tail in 1861?" "So it was said, anyhow," observed the Captain. "I well remember what nonsense there was in the papers about the 'phosphorescent auroral glare."
When in aphelion, or at its greatest distance, Eros is outside of the orbit of Mars, but when in perihelion it is so much inside of Mars's orbit that it comes surprisingly near the earth. Indeed, there are times when Eros is nearer to the earth than any other celestial body ever gets except the moon and, it might be added, except meteors and, by chance, a comet, or a comet's tail.
As if unconscious of Mildred's ignorance of their language, he said earnestly to her, "I did not know I vould gif my life for der schild der boor leedle poy I no dink dat he vas so sick," and his eager words and manner convinced Mildred that his wife misrepresented him, and that his interest in the mystery of the comet's fate would be slight compared with that which centred in his son.
The comet of 1843 is half suspected to belong to the group, and to be also a periodic body, revisiting our regions punctually at intervals of twenty-one years. The comet's motions strikingly illustrate the almost absolute voidness of space.
This action may have something to do with electricity, which is yet little understood; anyway, the effect is that, instead of attracting the matter toward itself, in which case we should see the comet's tails stretching toward the sun, the sun drives it away!
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