The music of the spheres : $b A nature lover's astronomyGrondal, Florence Armstrong
Science
The music of the spheres : $b A nature lover's astronomy
Grondal, Florence Armstrong
Astronomy
"The great majority were white, with a bluish or yellowish tinge; a
considerable number were red and orange; and a few were blue; many
surpassed the fixed stars in lustre and some were even brighter than
Venus--Most of the meteors left trains of vivid green light 5 degrees to
15 degrees in length, which marked their course through the heavens, and
endured for 3 seconds on the average, then became dissipated; though
some of the trains were almost 40 degrees in length, and remained in
sight for several minutes." The shower of 1899 was quite naturally
anticipated with much eagerness but it fell far short of the brilliant
displays seen in 1866 and 1833.
The third shower listed, the Andromids, radiate from the orange-gold
star on the foot of Andromeda during the last week in November. These
are best seen during the evening. They are also called the Biela meteors
and bring to mind the interesting history of the late Biela comet.
Many hundreds of these radiant points have now been discovered. The
meteors which appear in a direct line to the eye, appear as points or
stars; those appearing farthest from the center, other things being
equal, appear to have the longest trails but their paths are all
parallel. The illustration in perspective of the trains coming forward
from a point on the horizon of a desert illustrates this clearly.
Meteors, which represent the wreckage which comets strew along their
orbits, are not visible until they strike our atmosphere, which causes
them to glow. They "glow" because they become white-hot, and they become
white-hot because they have been rushing through space at planetary
speed, and striking our atmosphere is like striking a match against a
stone wall. The friction thus engendered causes the smaller particles to
burst into flame and melt in a streak of fire, although the larger ones
only melt on the outside, which is thrown off in a streaming tail of
incandescent matter, the remainder of the meteor falling to the earth
like a heavy rock. Thunders and visible explosions sometimes are
heard as an accompaniment of the falling meteor. The meteors which fall
to the ground are called "meteorites," or "ærolites," a literal
translation of the latter term being "airstone." On an average, however,
the individual bodies of a meteor swarm are very small, being
represented by "a cloud of silver dimes each about 250 miles from its
nearest neighbor." The smaller and lighter meteors called shooting stars
which are consumed in our atmosphere probably number from 10 to 20
million daily.
Public-domain text, read in full here on John Shaqi.
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