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 "silvery glow," which is such an attractive feature of the star
stream, is caused by the accumulated light of a dazzling torrent of
stars. These stars, or suns, are so unthinkably distant that their
individuality is lost like particles of mist, thus causing the
bright faces of Sirius, Capella and other great stars to seem suddenly
close.
This path of stars, called the Milky Way, stretches entirely around the
sky, or seems to do so, because our solar system rests almost within its
center--"almost" meaning within about 60,000 light years, which is
comparatively close to the center of a Galaxy some 300,000 light years
in diameter. If we could step off the earth and look at these stars they
would appear as a gigantic wreath; as it is, we see one half of the
wreath from the northern hemisphere and the other half by traveling to
the southern hemisphere. At least this much of the ancient conception of
the universe was correct--that our earth was situated near its
center--but the idea that the sun, moon and stars whirled around it for
its particular benefit, is looked upon as a vast conceit.
We now know for a certainty that our glorious Galaxy of stars is itself
but an item in space, for since the recent investigations with the
60- and the 100-inch telescopes at Mount Wilson observatory with which the
outer portions of the spiral nebulæ were resolved into swarms of stars,
we know that there are hundreds of thousands of Galaxies separated from
ours by a million light years, and from one another equally far.
Probably the smaller nebulæ are even more remote. And we used to
imagine that our own Galaxy floated through an infinite void of
boundless space as lorn and lonely as Wordsworth's "cloud"! Then science
goes still further and wonders if all these Galaxies form a part of a
starry region which extends indefinitely in all directions or whether
the star producing region is limited and surrounded by empty space!
"The eagle flying in the face of the sun is as naught to the audacity of
man poised on a speck in space, marshalling the heavenly host about him
and calling them by name across an abyss of space that may take years,
hundreds of years, thousands and possibly millions of years for light to
cross."
--_J. R. Collins._
Public-domain text, read in full here on John Shaqi.
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