Limits for the habitable zone

  • #26
DHF
244
32
Good points Damo,

considering how difficult it is to extend ourselves into low orbit and at this point technologically and logistically unrealistic to colonize outside of out planet. Assuming other nearby civilizations were comparable to our own contact would still be slim. Even if they didnt get wiped out.

Consider there is an as of yet undiscovered planet circling one of the three stars in Alpha Centuri and assume there is an intelligent society there with comparable technology. Assuming their astronomers have discovered our world (its questionable considering how close we are to our sun) they might send signals our way but we might not understand them as anything other then background noise. they might send a probe but if they are on the same level we are that would take millenia to reach us.

4.36 light years away and even if we each knew the other existed we would probably not be able to do anything more then guess if there was life there.

assuming we dont throw physics out the window and invent warp drive ;)
 
  • #27
34,661
10,802
SETI looks at a frequency range where we have sent signals as well, I think. If those aliens would think in a similar way about the frequency ranges (at least physics is the same there), we probably would have seen them now. If they send at completely different frequency ranges... well, bad luck.
Assuming their astronomers have discovered our world (its questionable considering how close we are to our sun)
Planets close to the sun are easier to detect, not harder - the Doppler shift increases. In general, the transit probability goes up, too, but for earth and Alpha Centauri no transits happen.

4.36 light years away and even if we each knew the other existed we would probably not be able to do anything more then guess if there was life there.
With an established frequency to transfer data, we would be able to get a reasonable data rate even with current radio telescopes.
 

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