Young Folks' Library, Volume XI (of 20): Wonders of Earth, Sea and Sky
Science
Young Folks' Library, Volume XI (of 20): Wonders of Earth, Sea and Sky
Science -- Juvenile literature
I have been speaking of the stars that are nearest to us, but there
are others much farther off. It is true we cannot find the distances
of these more remote objects with any degree of accuracy, but we can
convince ourselves how great that distance is by the following
reasoning. Look at one of the brightest stars. Try to conceive that
the object was carried away further into the depths of space, until it
was ten times as far from us as it is at present, it would still
remain bright enough to be recognized in quite a small telescope; even
if it were taken to one hundred times its original distance it would
not have withdrawn from the view of a good telescope; while if it
retreated one thousand times as far as it was at first it would still
be a recognizable point in our mightiest instruments. Among the stars
which we can see with our telescopes, we feel confident there must be
many from which the light has expended hundreds of years, or even
thousands of years, on the journey. When, therefore, we look at such
objects, we see them, not as they are now, but as they were ages ago;
in fact, a star might have ceased to exist for thousands of years, and
still be seen by us every night as a twinkling point in our great
telescopes.
Remembering these facts, you will, I think, look at the heavens with a
new interest. There is a bright star, Vega, or Alpha Lyræ, a beautiful
gem, so far off that the light from it which now reaches our eyes
started before many of my audience were born. Suppose that there are
astronomers residing on worlds amid the stars, and that they have
sufficiently powerful telescopes to view this globe, what do you think
they would observe? They will not see our earth as it is at present;
they will see it as it was years (and sometimes many years) ago. There
are stars from which if England could now be seen, the whole of the
country would be observed at this present moment to be in a great
state of excitement at a very auspicious event. Distant astronomers
might notice a great procession in London, and they could watch the
coronation of a youthful queen amid the enthusiasm of a nation. There
are other stars still further, from which, if the inhabitants had good
enough telescopes, they would now see a mighty battle in progress not
far from Brussels. One splendid army could be beheld hurling itself
time after time against the immovable ranks of the other. They would
not, indeed, be able to hear the ever-memorable "Up, Guards, and at
them!" but there can be no doubt that there are stars so far away that
the rays of light which started from the earth on the day of the
battle of Waterloo are only just arriving there. Further off still,
there are stars from which a bird's-eye view could be taken at this
very moment of the signing of Magna Charta. There are even stars from
which England, if it could be seen at all, would now appear, not as
the great England we know, but as a country covered by dense forests,
Public-domain text, read in full here on John Shaqi.
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