Appalling Depths Of Space





Distances that Stun the Mind and Baffle Comprehension.



The stars, though appearing small to us because of their immense

distance, are in reality great and shining suns. If we were to escape

from the earth into space, the moon, Jupiter, Saturn, and eventually the

sun would become invisible. Mizar, the middle star in the tail of the

Great Bear, is forty times as heavy as the sun. To the naked eye there

are five or six thousand of these heavenly bodies visible.



Cygni is the nearest star to us in this part of the sky. Alpha Centauri,

in the constellation of Centaur, in the Southern Hemisphere, is the

nearest of all the stars. The sun is off 93,000,000 miles; multiply this

by 200,000, and the result is, roughly speaking, 20,000,000,000,000; and

this is the distance we are from Alpha Centauri. At the speed of an

electric current, 180,000 miles per second, a message to be sent from a

point on the earth's surface would go seven times around the earth in

one second. Let it be supposed that messages were sent off to the

different heavenly bodies. To reach the moon at this rate it would take

about one second. In eight minutes a message would get to the sun, and

allowing for a couple of minutes' delay, one could send a message to the

sun and get an answer all within twenty minutes. But to reach Alpha

Centauri it would take three years; and as this is the nearest of the

stars, what time must it take to get to the others? If, when Wellington

won the battle of Waterloo, in 1815, the news had been telegraphed off

immediately, there are some stars so remote that it would not yet have

reached them. To go a step further, if in 1066 the result of the Norman

Conquest had been wired to some of these stars, the message would still

be on its way.





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