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It was
comforting to know that while we were dropping water
balloons off the tower, there was some serious work
being done downstairs in the Gravity Labs. Hidden
safely away from the tourist exhibits, is the top
secret Australian International Gravity Observatory
(AIGO). It is from here that a crack team of leading
scientists are working to ultimately detect, and
interpret gravity waves. These waves are formed from
gravitational disturbances, which include supernova
explosions, black holes, and ultimately the BIG
BANG. Gravity Waves are ripples which travel through
space, and virtually any object they encounter on
the way. Yes… that includes you and me. They stretch
and shrink everything they pass through. However,
not even an Emo can detect these minute vibrations,
so scientists are developing something even more
sensitive. Using a special Laser Interferometer, our
scientists hope to listen to gravity waves from the
“Big Bang”, and possibly eavesdrop on
extraterrestrial communications. The vibrating
gravity waves are the sounds of the universe, and
may hold the answers to life , the universe, and
everything. |
Biodiversity Walk
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Armed
with the centre’s Official Biodiversity
Bushwalk map, we accidentally wandered into
the top secret Gravitational Wave
Observatory. I lost 30 minutes of my life,
10 camera images, and woke up in… you
guessed it… the Stargazers Café. So
school kids, when the teacher says stay with
the group, you should stay with the group.
The guys at the centre, kindly left this
image of the Laser Interferometer on my
memory card. |
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TIP:
Some walkers on the Biodiversity Bushwalk
have been buzzed by unidentified flying
objects. Life On Perth suggests spraying on
fly repellent before leaving. |
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| How
Does It Work? |
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The vibrations
generated by gravity waves are extremely faint,
meaning Laser Interferometers need to be incredibly
sensitive, and isolated from other disturbances. The
silica sand of the Wallingup Plain is rather good at
absorbing earthly seismic waves. |
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The detector
assembly is made up of two really long vacuum pipes,
situated at right angles to each other. A super
bright laser beam is split in two, and sent down the
pipes. The beams are reflected back by super
mirrors, with such precision they would ordinarily
cancel each other out! |
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By a stroke of
good luck, gravity waves vibrate, and this upsets
the perfect equilibrium when they pass through the
laser beams. This excites the laser light, and the
resulting variation in brightness is noticed by
light sensors. This disturbance is amplified, and
sent to a speaker, where a group of super excited
scientists eagerly listen in. The longer the vacuum
pipes are, the better they become at detecting
Gravity Waves. This is because the wave disturbance
in the laser beam is more pronounced, with increased
length. Size matters when it comes to Laser
Interferometers, and our scientists have a 5km pipe
dream. They are presently happy with their 80 metre
system, or so they say. |
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Gravity Wave
detection requires a worldwide array of laser
interferometers, of which the Gingin Observatory is
the Southern Hemisphere arm. Using a network of
detectors around the world, the direction of a wave
can then be calculated, by observing it’s varying
arrival times at different locations. |
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