THE MICHIGAN DAILY SATT

Aller Lists Advantages
Of Southern Hemisphere

By MICHAEL JULIAR
The southern hemisphere has
many advantages over the north-
ern hemisphere for the astrono-
mer, according to Prof. Lawrence
H. Aller of the astronomy depart-
ment.
Speaking at an astronomical
colloquium given yesterday, Prof.
Aller listed the many astronomi-
cal "jewels waiting to be picked up
from the ground, or as in this
case, from the heavens." He men-
tioned the chance to study the
Magellanic clouds and the center
of the Milky Way as well as the
opportunity to map many of the
uncharted stars in the southern
hemisphere.
Prof. Aller recently spent a year's
sabbatical in Australia on a Na-
tional Science Foundation grant.
He pointed out the fact that
in the northern hemisphere there
are only two bright nearby gal-
axies. These galaxies, Andromeda
and Triangulum, are a million and
a half to two million light years
from the earth. However, in the
southern hemisphere the globular
star clusters are brighter than the
northern hemisphere galaxies and
are ten times closer to the earth.
Star Clusters
These star clusters are impor-
tant because they help to check
theories of stellar evolution, Prof.
Aller said.
In studying the planets there
is no real advantage, except in
the case when Mars comes closest
to earth. Then, southern astrono-
mers have an advantage in view-
ing the planet because at that
moment, Mars' eccentricity brings
it into the southern hemisphere.
But, Aller said, this advantage will
probably be lost in the ensuing
years when balloons and satelite
will be used for astronomical ob-
servations.
He showed movies and slides of
some of the new observatories
springing up in Australia. He
noted that some of these ob-
servatories are short on staff per-
sonel and, in fact, one of them

is lacking a director as well as a
full staff.,
Included among the pictures
were some showing the construc-
tion of the now completed giant
radiotelescope at Parks, Australia,
a town 200 miles west of Sydney.
The diameter of the dish of the
radiotelescope is 210 feet.
Precise Construction
Prof. Aller said that the con-
struction of such a large structure
needs to be very precise so that
it can be put to accurate use. A
tolerance of no more than a half
inch is allowed with a wind velo-
city of less than ten miles per
hour.
In order to keep within this
tolerance, welding of the metal
for the radiotelescope is mostly
done at night when the air tem-
perature is constant. During the
day, the hot Australian sun does
not permit the constant tempera-
ture needed, Aller added.
Stassen To Speak
On Disarmament
Harold Stassen, advisor on dis-
armament to former President
Dwight D. Eisenhower, will address
the Challenge Colloquium today
on "History and Problems of Ne-
gotiations" at 11 a.m. in the Union
Ballroom.

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Tues., Dec. 12th
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EPISCOPAL STUDENT
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306 North Division
Phone NO 2-4097
SUNDAY-
8:00 A.M. Holy Communion.
9:00 a.m. Holy Communion followed by
breakfast at the Canterbury House.
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11:00 a.m. Morning prayer and sermon
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Dec. 8:-Holy day of Obligation-Feast of the
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Saturday, Dec. 2-7:00 p.m. "Leadership Ban-
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speaking. Orchestra Dance till Midnight.
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THE FIRST PRESBYTERIAN CHURCH
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SUNDAY, DECEMBER 3, 1961

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9v:00 "__"_ _"" _ _""__"__"_'__" __" 6 years of age.)
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10:30-11:30 a.m. Bible Study, "The Book of and East Williams
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"Topics of Ultimate Concern." Telephone NOrmandy 3-4061 Students of the United Christian

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