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Earth Could
Disappear!
There is a theory that believes that earth is disappearing and
there is very little time left for aliens to contact us. One
scientist named Frank Drake pointed out at a SETI workshop at
Harvard University that television services are changing the way
they send signals and these signals are being sent using
technology that does not use radio waves. This may be good news
also for SETI since efforts were always focused on finding radio
waves and none have been found and this may be less worrisome for
the earth. Scientists always used radio waves to try and find
intelligent life in the universe. To us these were our strongest
sign that there was life, since a TV antenna puts out one bubble
of a radio wave which is only worth one megawatt and that radio
wave now goes about 50 light years away from our solar system.
This is changing with television stations delivering programs
through cable lines that emit no radio waves and there is no radio
frequency either. Nothing leaks to space to spot of out. Even
direct broadcasts that send programs through satellites only emit
a very small amount, just 20 watts per each channel. These are
very efficiently directed straight down to the user on earth's
surface, allowing a very slim chance of any intelligent life
picking up on the radio wave. So, the chance of being detected has
become very slim, that is if that is how intelligent life would be
looking for us. This is how we have always calculated intelligent
life on other worlds and the chances of life being there. Drake's
theory being that we should focus less on radio signals being sent
because the longevity of the life maybe equal to the distance the
signal came from and we should start focusing more on signals that
are intentionally sent to us.
SETI strategies have begun a shift to looking for very direct
signals being sent to us. They are looking even for optical
beacons with different high powered lasers that are very
deliberately aimed at any nearby stars and objects while optical
communications were originally thought to be impractical and would
not work, with a laser that is powerful enough finding signals
this way can actually be much more efficient than looking for
radio signals. They have gone so far as to use nuclear powered
lasers as a possible tool find signals with due to the immense
strength they provide. They could produce pulses that could
outshine the sun by 10,000 a Harvard University physicist Paul
Horowitz stated. He been searching for these pulses for some time.
The telescope he designed will be used only for seeking out these
signals from UFOs.
As new ways keep being created to look for signals are other life
out there, we may one day find what we are looking for. It may not
be as far off as once believed. |
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