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Voyager mission in deep space



 
 
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  #1  
Old July 2nd 12, 06:11 AM posted to sci.space.policy
signifiespost
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Posts: 10
Default Voyager mission in deep space

Probably, in all its enthusiasm, the Voyager mission left safety precautions about maintaining confidentiality on humanity and discloses on board, many uncomfortable details about earth and humanity!
Link:
http://signifies.net/voyager-discloses-about-humanity/
  #2  
Old July 2nd 12, 06:29 AM posted to sci.space.policy
Sylvia Else[_2_]
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Posts: 458
Default Voyager mission in deep space

On 2/07/2012 3:11 PM, signifiespost wrote:
Probably, in all its enthusiasm, the Voyager mission left safety precautions about maintaining confidentiality on humanity and discloses on board, many uncomfortable details about earth and humanity!
Link:
http://signifies.net/voyager-discloses-about-humanity/


By the time Voyager gets somewhere where the confidentiality might be an
issue, the human race will either be extinct, or will be well able to
look after itself against any puny aliens.

Sylvia.




  #3  
Old July 2nd 12, 12:06 PM posted to sci.space.policy
Bob Haller
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Posts: 3,197
Default Voyager mission in deep space

On Jul 2, 1:29*am, Sylvia Else wrote:
On 2/07/2012 3:11 PM, signifiespost wrote:

Probably, in all its enthusiasm, * the Voyager mission left safety precautions about maintaining confidentiality on humanity and discloses on board, many uncomfortable details about earth and humanity!
Link:
http://signifies.net/voyager-discloses-about-humanity/


By the time Voyager gets somewhere where the confidentiality might be an
issue, the human race will either be extinct, or will be well able to
look after itself against any puny aliens.

Sylvia.


We have been broadcasting our presence by radio and tv for how many
years?

not only would ETs know we exist, but lots about our actions Wars
etc.........

i wonder how far the futherest radion waves have traveled by now?

putting it another way, if we were the ETS would we want to go meet
people liker ourselves?
  #4  
Old July 2nd 12, 12:53 PM posted to sci.space.policy
hg
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Posts: 60
Default Voyager mission in deep space

On 02/07/2012 16:06, bob haller wrote:
snip

We have been broadcasting our presence by radio and tv for how many
years?

not only would ETs know we exist, but lots about our actions Wars
etc.........

i wonder how far the futherest radion waves have traveled by now?


That's such an easy physics question even I can answer it! Radio
travels at the speed of light so given our radio has been
transmitting for at least a 100 years our transmissions have traveled at
least 100 light years distance.


putting it another way, if we were the ETS would we want to go meet
people liker ourselves?



--
T
  #5  
Old July 2nd 12, 12:59 PM posted to sci.space.policy
Alan Erskine[_3_]
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Posts: 1,026
Default Voyager mission in deep space

On 2/07/2012 9:06 PM, bob haller wrote:


We have been broadcasting our presence by radio and tv for how many
years?

not only would ETs know we exist, but lots about our actions Wars
etc.........

i wonder how far the futherest radion waves have traveled by now?

putting it another way, if we were the ETS would we want to go meet
people liker ourselves?



As has been said many times before, the signals we have been sending out
are very low power and therefore very short range. It wouldn't even
reach the nearest star outside our solar system.
  #6  
Old July 2nd 12, 01:24 PM posted to sci.space.policy
Bob Haller
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Posts: 3,197
Default Voyager mission in deep space

On Jul 2, 7:59*am, Alan Erskine wrote:
On 2/07/2012 9:06 PM, bob haller wrote:



We have been broadcasting our presence by radio and tv for how many
years?


not only would ETs know we exist, but lots about our actions Wars
etc.........


i wonder how far the futherest radion waves have traveled by now?


putting it another way, if we were the ETS would we want to go meet
people liker ourselves?


As has been said many times before, the signals we have been sending out
are very low power and therefore very short range. *It wouldn't even
reach the nearest star outside our solar system.


thats assuming the ETs receivers are no better than our own........
  #9  
Old July 2nd 12, 02:22 PM posted to sci.space.policy
Jeff Findley[_2_]
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Posts: 1,388
Default Voyager mission in deep space

In article , lid
says...

On 2/07/2012 10:43 PM, Jeff Findley wrote:
In article 529ee44e-f348-4443-a0fa-
, says...

On Jul 2, 7:59 am, Alan Erskine wrote:
On 2/07/2012 9:06 PM, bob haller wrote:



We have been broadcasting our presence by radio and tv for how many
years?

not only would ETs know we exist, but lots about our actions Wars
etc.........

i wonder how far the futherest radion waves have traveled by now?

putting it another way, if we were the ETS would we want to go meet
people liker ourselves?

As has been said many times before, the signals we have been sending out
are very low power and therefore very short range. It wouldn't even
reach the nearest star outside our solar system.

thats assuming the ETs receivers are no better than our own........


It's all of the background noise that would be a problem. Even if they
could amplify the signal, they'd also amplify the background noise.

Physics. Learn some.


With a suitable (this is big directional) antenna, they can achieve a
sufficient signal to noise ratio.


There are limits to this. The orbit of the earth limits how far away
from the sun our transmissions can be. Add to that fact that the sun
outputs electromagnetic radiation, and you've got the beginnings of the
problem the ET's would need to solve. They're antenna would need to be
*very* directional indeed to mask the output of our sun while searching
for transmissions from any planets in our solar system.

However, the more directional the antenna, the more difficult it is to
pick anything up by chance.


I'm not a radio telescope expert, but there must be a hard limit,
imposed by physics, to how far away the ET's could be and still be able
to pick out our faint signal while masking our sun's emissions. By
astronomical standards, that limit certainly won't be very far.

"Space," says Douglas Adams' The Hitchhiker's Guide to the Galaxy, "Is
big. Really big. You just won't believe how vastly hugely mind-
bogglingly big it is. I mean, you might think it's a long walk down the
road to the chemist, but that's just peanuts to space."

Jeff
--
" Ares 1 is a prime example of the fact that NASA just can't get it
up anymore... and when they can, it doesn't stay up long. "
- tinker
  #10  
Old July 2nd 12, 02:43 PM posted to sci.space.policy
Sylvia Else[_2_]
external usenet poster
 
Posts: 458
Default Voyager mission in deep space

On 2/07/2012 11:22 PM, Jeff Findley wrote:
In article , lid
says...

On 2/07/2012 10:43 PM, Jeff Findley wrote:
In article 529ee44e-f348-4443-a0fa-
, says...

On Jul 2, 7:59 am, Alan Erskine wrote:
On 2/07/2012 9:06 PM, bob haller wrote:



We have been broadcasting our presence by radio and tv for how many
years?

not only would ETs know we exist, but lots about our actions Wars
etc.........

i wonder how far the futherest radion waves have traveled by now?

putting it another way, if we were the ETS would we want to go meet
people liker ourselves?

As has been said many times before, the signals we have been sending out
are very low power and therefore very short range. It wouldn't even
reach the nearest star outside our solar system.

thats assuming the ETs receivers are no better than our own........

It's all of the background noise that would be a problem. Even if they
could amplify the signal, they'd also amplify the background noise.

Physics. Learn some.


With a suitable (this is big directional) antenna, they can achieve a
sufficient signal to noise ratio.


There are limits to this. The orbit of the earth limits how far away
from the sun our transmissions can be. Add to that fact that the sun
outputs electromagnetic radiation, and you've got the beginnings of the
problem the ET's would need to solve. They're antenna would need to be
*very* directional indeed to mask the output of our sun while searching
for transmissions from any planets in our solar system.

However, the more directional the antenna, the more difficult it is to
pick anything up by chance.


I'm not a radio telescope expert, but there must be a hard limit,
imposed by physics, to how far away the ET's could be and still be able
to pick out our faint signal while masking our sun's emissions. By
astronomical standards, that limit certainly won't be very far.


I don't think there's a limit in that sense. Quantum mechanics says that
there's a certain minimum size of antenna that will work for a given
frequency at a given distance (because otherwise you'd violate the
uncertainty principle regarding the lateral position and momentum of the
individual arriving photons). It seems to me that if you double the
distance you have to double the linear dimension of the antenna.

Eventually, of course, it becomes unmanagably large.

Sylvia.



 




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