national
Battalion/Page 9
April 22, 1982
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United Press International
WASHINGTON — A mas
sive star 9,000 light years away in
the Milky Way galaxy has shown
signs it may be heading toward
an explosive death soon and
would be so bright, it could be
1 seen in broad daylight.
Dr. Kris Davidson of the Uni
versity of Minnesota said in a
National Science Foundation re
port released Tuesday the stel-
: lar explosion could occur any
I time — next week or 100,000
years from now. Either would be
I soon by cosmic standards.
The star is Eta Carinae — the
[ largest star in the Milky Way and
! one of the most massive known
| in the universe. It is called a uni-
| que blue supergiant and has
I more than 100 times the mass of
\ our sun.
Astronomers say that when it
blows up, the star would release
J an enormous burst of energy —
H light equal to billions of suns and
lasting a matter of weeks.
Such an explosion, called a su
pernova, is believed to occur
when a star has used up all its
available fuel and collapses. The
last supernova to occur in the
Milky Way was observed in
1604.
Although there have been
suggestions radiation from rela
tively nearby supernovae mil
lions of years ago may have been
responsible for climate disasters
or mass extinctions on Earth,
Dr. Nolan Walborn of Cerro
Tololo Inter-American Obser
vatory in Chile said Eta Carinae
is too far away to affect the
Earth.
However, he says, when the
star explodes, it should appear
four or five times brighter than
Venus at its peak.
Eta Carinae is in the sky of the
Southern Hemisphere and can
be seen only from Florida and
Texas in the United States, graz
ing the southern horizon of the
sky.
Davidson, Walborn and Dr.
Theodore Gull of the Goddard
Space Flight Center, Greenbelt,
Md., said the key clue to the Eta
Carinae’s likely fate was the dis
covery that glowing hot gas,
which spewed out from the star
150 years ago, contains much
more nitrogen than expected.
Davidson said the nitrogen
had to be produced by a particu
lar set of nuclear reactions at the
core of the star, and this hap
pens only after a star has been
around for a while. The nit
rogen then had to make its way
to the star’s surface and wait to
be ejected into space. This, he
said, “tells us the star already
must have lived through much
of its possible life.”
Although scientists discuss
the star’s fate in the present
tense, Eta Carinae’s distance
from Earth means the light
astronomers now are seeing
from the star actually originated
9,000 years ago. It may already
have exploded, but astronomers
would not know it until the
radiation reached the Earth.
Arizona man trapped;
still in Mexico cave
United Press International
HUAUTLA DE JIMENEZ,
Mexico — An injured American
trapped since Friday in a 900-
foot crevice in a cave probably
will not be freed before Satur
day, officials said.
Police said Tuesday it would
take at least four more days to
free Doug Powell, 22, of Tus-
con, Ariz., who broke his shoul
der when he fell into the crevice
as he was exploring the 24-mile
stretch of caves high in the Sier
ra de Juarez moutains near the
town of Huautla, 180 miles
southeast of Mexico City.
I “It’s really complicated,” said
Jose Farca, of the Mexico City
Police Rescue and Medical
mergency Squad. “They have
to lift him through some pas
sageways about a foot wide. But
they won’t quit until he’s out.”
The rescue team found
Powell trapped in the narrow
ravine Sunday after exploring
the maze of tunnels and pas-
isageways of the five-cave system.
Farca said rescuers would not
able to bring Powell to the
surface before Saturday because
of the rugged climb out of the
900-foot-deep crevice where he
was trapped.
He said five cave specialists
and a doctor from his squad
were helping Powell. Other than
the broken shoulder suffered
when he slipped into the pas
sage, Powell was in good physic
al condition, the doctor said.
Powell’s father, Dr. Hasting
Powell of Tucson, sent a Texas
doctor and a spelunker — a cave
explorer — who were working
with the Mexican team, Farca
said.
Capt. Heriberto Lopez Pine
da, head of the Mexico City re-
|scue unit, said police first
■earned of the mishap from
Mexican cave explorer Alejan
dro Villagomez, who was with are threaded by an under-
Power when he was injured. ground river that makes explor-
The caves, discovered in ation hazardous except during
1967, are 3,666 feet deep and the dry spring months.
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