On Thu, Oct 14, 2021 at 5:57 PM 'Brent Meeker' via Everything List < [email protected]> wrote:
*> I don't know how you conclude an intelligent civilization would be > obvious;* Even if you make the ridiculously conservative assumption that ET will never be able to achieve speeds any faster than we can with our space probes, they could still send a Von Neumann Probe to every star in the Galaxy in less than 50,000 years, and the night sky would never look the same again. I'm not talking about perpetual motion machines or time machines or faster than light travel, a Von Neumann Probe does not need any new science, just improved engineering, the ability to place individual atoms where you want them to be. John K Clark See what's on my new list at Extropolis <https://groups.google.com/g/extropolis> sox oo6 > > On 10/14/2021 1:31 PM, John Clark wrote: > > On Thu, Oct 14, 2021 at 1:21 AM 'Brent Meeker' via Everything List < > [email protected]> wrote: > > * > If you notice, our radiation to space has decreased as we have used >> higher frequencies and more directed communication (like fiber optics and >> directional antennae) and as we compress and encrypt the radiation will >> look more and more thermal.* >> > > That's true, the Earth's radio signature became much more random looking > after June 12 2009. On that date all TV transmitters in the USA switched > over from analog to digital. This made things more difficult for a > hypothetical ET to infer from radio alone that intelligent life exists on > the planet for two reasons: > > 1) Digital TV transmitters use far less power than the analog variety. > > 2) An analog TV signal obviously came from a technological civilization, > but if you didn't know the particular compression codec used by digital > broadcasters in the USA , and ET wouldn't, then the signal would *almost* > look like white noise. The compression is not perfect, that's why I said > "almost". > > However there is more to life than radio so I don't think this can be used > as an excuse to explain away the no show of ET. If an intelligent > civilization had existed in the galaxy for millions or billions of years > then I don't think you'd need a radio to detect it, such an advanced > civilization would be obvious to a blind man in a fog bank. > > > If it existed for a mere million years it might not overlap with our > existence and hence not be detected. > > I don't know how you conclude an intelligent civilization would be > obvious; since the point of my post is the more advanced the civilization > the more likely it is to become dim and look thermal. > > Brent > > > > John K Clark See what's on my new list at Extropolis > <https://groups.google.com/g/extropolis> > oo6 > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/CAJPayv008cu1t4S8-yV_%3DAKBXS26LSGO_ZF0M8XM3FC0Ct3_Ag%40mail.gmail.com > <https://groups.google.com/d/msgid/everything-list/CAJPayv008cu1t4S8-yV_%3DAKBXS26LSGO_ZF0M8XM3FC0Ct3_Ag%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > > -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/everything-list/f611cd5c-91cb-d0e8-2126-4be9f429ba14%40verizon.net > <https://groups.google.com/d/msgid/everything-list/f611cd5c-91cb-d0e8-2126-4be9f429ba14%40verizon.net?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAJPayv2%2BdpjCuk-9_8VXXdMi%2BxmUFZB4%3DXTDacdoQw-vva_NOQ%40mail.gmail.com.
