OK, that gets you something. But suppose that you had a twin at Proxima Centauri, with the same tech level as we have. Could you send a message that your twin could receive? One big enough to carry the information in question here? How long would it take, and how much money would each of you have to invest in the equipment?
As I understand it, we’re getting pretty good at sensing small signals these days, and we still find it challenging to notice entire planets. Scaling up obviously helps, but the cost scales right along with the capability. You can say, as you do elsewhere, that “advance civilization has larger receivers”, but why would they waste resources on building such receivers?
I asked AI about it and it told me that large radiotelescope may suffice. However, the main uncertainty is receivers equipment. If they are on Proxima, they suspect that there is life near Sun, so constant observations are possible—but the size of receiver depends on Kardashev level of civilization.
Advance civilizations will have larger receiving dishes, may be the size of Dyson spheres—but such civilizations are farther (or they will be here).
Therefore, relation distanace/reciver-size is approximately constant.
Doesn’t need to be omnidirectional. Focus on most perspective locations like like nearby stars, our galaxy center, Andromeda’s most suitable parts.
OK, that gets you something. But suppose that you had a twin at Proxima Centauri, with the same tech level as we have. Could you send a message that your twin could receive? One big enough to carry the information in question here? How long would it take, and how much money would each of you have to invest in the equipment?
As I understand it, we’re getting pretty good at sensing small signals these days, and we still find it challenging to notice entire planets. Scaling up obviously helps, but the cost scales right along with the capability. You can say, as you do elsewhere, that “advance civilization has larger receivers”, but why would they waste resources on building such receivers?
I asked AI about it and it told me that large radiotelescope may suffice. However, the main uncertainty is receivers equipment. If they are on Proxima, they suspect that there is life near Sun, so constant observations are possible—but the size of receiver depends on Kardashev level of civilization.
Advance civilizations will have larger receiving dishes, may be the size of Dyson spheres—but such civilizations are farther (or they will be here).
Therefore, relation distanace/reciver-size is approximately constant.