3 ms·

That's my point. A green star would signal to anyone in the universe that something is really off here and most likely achieved by unnatural means (aka and adva

That's my point. A green star would signal to anyone in the universe that something is really off here and most likely achieved by unnatural means (aka and advanced civilization). This would attract attention. which the civilization that sent the beacon can take advantage of for various reasons. There are many such beacons that could be placed all over the universe to attract attention.

hnuser123456 2y ago
I see what you're getting at. My thoughts on that topic are... it would be really hard to make a recognizable signal that crosses a significant fraction of the universe, or even galaxy. There could be a laser-pointer-green sun on the other side of the Milky Way, but a single sunlike star is already impossible to detect on the other side of the galaxy, much less in another galaxy. 95% of the brightest stars in the sky are less than 1000ly away, while the galaxy is 100,000ly across. The ones that are over 1000ly away and still visible are extremely large, unusual stars. R136a1 is one of the brightest stars known, at almost 5 million times the luminosity of the sun, it's just outside the Milky Way in the LMC, and it required 3.6 meter telescopes to tell that it was multiple extreme stars around a single, very extreme star. In any telescope picture where R136a1 is visible, a regular sun-like star in the vicinity would be invisible. There are no images of "normal" stars more than 1000ly away because they just combine into an ambient glow of space. The amount of energy needed to broadcast a signal to the entire galaxy (much less universe) requires something like a supernova, which... just looks like a supernova. https://en.wikipedia.org/wiki/R136a1 https://en.wikipedia.org/wiki/R136a1
- nowittyusername 2y ago
  That is true they are feint to civilizations that don't have the capacity to view them because of technological constraints. Those are exactly the civilizations you don't care about anyways, as they wont have the capacity to visit the site at that technological level nor respond with a signal in that general direction. So the beacon you place is trying to attract attention from a specific tech civilization you are interested in (from their perspective). Also when i say beacon i mean the green star. But not an active beacon, you place a dump particle swarm around the star that refracts light in to the green spectrum that's not possible by natural star type of deal. So energy wise not too intensive once you get the particles around the star. But there could be other methods as well that have nothing to do with green stars. For example another "beacon" could be augmentation of some sort near the most interesting objects in the universe... the black holes at the heart of almost every galaxy. You know as a conscious entity that others will look in that general direction as that is the most interesting place in the "neighborhood" so it warrants to do something round those parts to attract attention.
- hnuser123456 2y ago
  On the other hand, if you could reliably trigger a supernova once every exactly once per year for 10 years, that's a strange and unique signal.

hnuser123456 2y ago

I see what you're getting at. My thoughts on that topic are... it would be really hard to make a recognizable signal that crosses a significant fraction of the universe, or even galaxy. There could be a laser-pointer-green sun on the other side of the Milky Way, but a single sunlike star is already impossible to detect on the other side of the galaxy, much less in another galaxy. 95% of the brightest stars in the sky are less than 1000ly away, while the galaxy is 100,000ly across. The ones that are over 1000ly away and still visible are extremely large, unusual stars. R136a1 is one of the brightest stars known, at almost 5 million times the luminosity of the sun, it's just outside the Milky Way in the LMC, and it required 3.6 meter telescopes to tell that it was multiple extreme stars around a single, very extreme star. In any telescope picture where R136a1 is visible, a regular sun-like star in the vicinity would be invisible. There are no images of "normal" stars more than 1000ly away because they just combine into an ambient glow of space. The amount of energy needed to broadcast a signal to the entire galaxy (much less universe) requires something like a supernova, which... just looks like a supernova. https://en.wikipedia.org/wiki/R136a1 https://en.wikipedia.org/wiki/R136a1

nowittyusername 2y ago
That is true they are feint to civilizations that don't have the capacity to view them because of technological constraints. Those are exactly the civilizations you don't care about anyways, as they wont have the capacity to visit the site at that technological level nor respond with a signal in that general direction. So the beacon you place is trying to attract attention from a specific tech civilization you are interested in (from their perspective). Also when i say beacon i mean the green star. But not an active beacon, you place a dump particle swarm around the star that refracts light in to the green spectrum that's not possible by natural star type of deal. So energy wise not too intensive once you get the particles around the star. But there could be other methods as well that have nothing to do with green stars. For example another "beacon" could be augmentation of some sort near the most interesting objects in the universe... the black holes at the heart of almost every galaxy. You know as a conscious entity that others will look in that general direction as that is the most interesting place in the "neighborhood" so it warrants to do something round those parts to attract attention.
hnuser123456 2y ago
On the other hand, if you could reliably trigger a supernova once every exactly once per year for 10 years, that's a strange and unique signal.