Relax wrote:TLB, Thinksmarkedly et al
Well, I do know we can easily see small planets and their EMS signature from 5 Light Years away. Such as: https://science.nasa.gov/missions/hubbl ... i-a-and-b/
Now is that 50 Light years? No.
DO I know personally enough about this topic to say yes/no? No.
As for Cosmic Dust: I was under the impression from an amateur astronomer I talk to fairly regularly and have gone star gazing occasionally with that anything within ~1000 LY is not a problem due to dust. So definiton of "not a problem" is ...well shall we say clouded in opaque dust cloud.
Finding the star is easy, though it gets progressively more difficult to find dwarf stars as the distance goes up. Which is also why they're called "dwarfs" in the first place: we couldn't see the majority of them, so we tended to think they were the minority. It turns out that only about 0.12% of all stars are not dwarfs.
Finding that a planet or planets are orbiting the star seems to be easy too. We have several methods for doing that and they aren't very expensive. Local astronomers may amuse themselves in researching the outwards directions of their settlement and submitting papers to the Galactic community.
Finding electromagnetic emissions from such planets is tricky. Because they attenuate quite quickly, unless it's an intentional beacon or very, very loud, you're not going to hear the transmissions from a civilisation over 100 light-years away. It is easier to search for other signs of technology, such as Dyson Spheres.
Of course while reading Barnhams compendium, when making a more realistic uh reply: I remember Barnard 68, which is a dust cloud 125pc away(uh, ~3.x LY/pc) so ~375LY away. Can't see a SINGLe star behind it optically. https://upload.wikimedia.org/wikipedia/ ... ard_68.jpg Of course Bernard 68 is a small dust object. So, seeing around it from a different angle would be ~trivial. Or just use Infrared and we can see through it: https://pressbooks.online.ucf.edu/astro ... smic-dust/ Our neighborhood in HV would be contained ENTIRELY within the inner ring of THIS picture: https://en.wikipedia.org/wiki/Milky_Way ... secs_(2022).png That is not much dust obscured potential regions to hide in.
Good point. Darius doesn't have to be inside of a dust cloud. It just needs to be behind one compared to the rest of the settled Galaxy. There are nebulae aplenty to obscure the line of sight.
IF you really want to blow your mind(modern finds using much better telescopes than we used to have), most spiral galaxies have perpendicular "hoop" rings to their major plane of their spiral spin direction. These hoops can be upwards of 2Million light years long on their axis, though most are MUCH MUCH smaller. For all we know Sol, could be at the base of such a perpendicular arm looping upwards of 200,000LY or more and attaching back down on the other side of the galaxy. Think HALO(ring world) except in stars perpendicular to plane of galaxy. There are so many Sci Fi Stories I could think about on this perpendicular arm and their lack of interaction with rest of the galaxy where vast majority of aliens are etc.
We know our galactic vector fairly well and we know we are roughly on the plane of the Galaxy and we don't have anywhere near the perpendicular velocity to leave it. We do oscillate up and down the plane, that's all.
With so many "belter" communities in the HV living OFF planet and IN space, one would think that with FAR superior viewing of the stars than anywhere on a planet that amateur SKY viewing in the HV future would be a near EVERYDAY occupation with forums dedicated to best planetary shot of nearby star contest of the week or some such continuously happening.
We have not heard of many "belter" communities in the HV. The fact that the first thing they do in a system is go down to the planet and promptly lose their space capability indicates so. In my opinion, that's stupid but I have to suspend disbelief here. One would expect that the first thing someone does in a new star system would be to set up orbital industries to replicate your current level of technology, before going down the gravity well.
We've had this discussion before (when penny was still cthia) and had an argument about whether people would want to "get over it right now" after a years- or centuries-long voyage.
As for collecting the information, Put up a small prize pool money and that will take care of itself. The amateurs will already be doing it and will jump at opportunity to make a little $$ for bragging rights.
Lots of false positives. And, as I said, true positives of real colonies no one knew was there, but aren't Darius.
If NOTHING else, this would eliminate vast swathes of space you do not have to scout for potential hidden bases. Small bases you don't care about. Its those monster 100km ++++ shipyards glowing into space with giant fusion reactor signatures glowing in the asteroid belts and refineries closer in that no one can hide. Not the minor Hole in the Wall's leading to Galton.
Absence of evidence is not evidence of absence. It might reduce the likelihood that the base is in that region, but it cannot be eliminated.