Audubon Republican. [volume] (Audubon, Iowa) 1894-1925, 1921-07-28

ply vi liz 0hAfNA"'NS
of Chicago.
The human race, which
Tor thousands of years fondly believed
their little solar system to be the
center Of the physical universe, but
later unwillingly revised that opinion.
can now be assured that neither the
earth nor the flaming sun Itself Is
even visible from great stars which
scientists are measuring, and which
are proving to be of prodigious size.
Experts. working under Professor
Michelson's direction, have just COM
puted the diameter of Alpha Orionis,
q star In the constellation Of Orion,
which. except among astronomers, Is
usually called Betelgeuse. Using the
new invention. they found that Alpha
Orionis. or Betelgeuse, is 300.000,000
miles In diameter, a diameter 800 times
rs large as that of the sun. And since
the mass of the sun is about $4,000
times greater than that of the earth,
the relative sizes of Alpha Orionls and
earth can be seen easily.
Figures like these are hardly to be
grasped by the mind until they have
been put into everyday terms. The
diameter given means that Alpha has
circumference of more than 100000
900 miles. A railroad train travelling
without a stop at the rate of 90 miles
an hour would require 10000 600 hours,
or $4,000 days, or 1712 years. just to
go completely around the star. And
computing the life of a generation at
30 years, 1t would be the fifty-second
generation Of the original passengers
on the train who would see the end
Of the journey. To be completing the
trip now, ancestors of the present pas
sengers would have had to start up
on their journey In the year 200 A. ID.
Light, which travels at the rate OF
10000 miles a second, would require
4,S39 seconds, or SO1a minutes, just to
fash around the staggering bulk Of
Alpha 0rioDis.
Earth Very Small.
The planet Mars, that familiar red
point In the sky, maintains an average
distance of 141, 100000 miles from the
sun, which means that the entire or
bit Of this planet as 1t goes hurtling
through space Is smaller than the d.
ameter of Alpha orionis. The Marian
year Is 6S7 days, but even the terrific
speed of Mars would not enable IL
TO encirele Alpha within that period.
Compared with the monster stars
being measured by means of Profess
sor Michelson's Invention at the Mount
Wilson observatory In California, the
earth Is about the size Of a nudge.
For certain remote stars are proving
TO be much vaster than previously sup
posed. Unless the results of the new
mode of measurement are successful.
y challenged, the astronomers win
have to revise many of their calcula-
tons In regard TO the universe of stars.
The perfection of Professor Michel
sons method for ascertaining the ex.
act dimensions of stellar bodies was
announced at a session of the Ameri.
can Association for the Advancement
Of Science. held In Chicago recently.
II has been described as an event Of
stupendous importance in scientific
progress.
The method also has been applied
by a member of the staff at Mount
wilson observatory In measuring
the star Capella. which has been
known from spectroscopic evidence to
be really double star. although the
twins are so near each other that they
appear as one, even through the most
powerful telescopes. BY using Profess
sor 'Aiichelson's attachment on the
eight-foot telescope at the observatory,
It was found possible to measure the
minute angle, only .045 of a second,
subtended by the two stars and to de-
termine their successive positions as
they revolved In their orbits. Put in.
to the language Of the market place,
It was like measuring the head Of
pin more than 1000 miles away.
A brief description of Professor MI
ehelson's instrument is as follows:
The mirror Of an eight-foot telescope
rs obscured by an Opaque cap with Sits