For those unfamiliar with the likes of Sirius; it's just been the closest other possibility of whatever it took in order to have sufficiently UV illuminated into our solar system, with adequate energy influx for growing things via photons, as to have subsequently created such a truly horrific photosynthesis event cycle (thousands of years worth at a time), that which best accounts for the recorded cycles of CO2 as prior to modern mankind influencing the present day cycle of CO2 that's become more like the trajectory of a nuclear powered rocket ship, as in still going vertical as though there's no end in sight. Those CO2 cycles which have clearly indicated upon there being in a 110,000 year cycle, as for nothing attributed from our sun could have accomplished this task without irradiating all there is into nonlife, which simply is not the sort of environment as indicated within those core samples, which have thus far been accumulated and recorded back to 400,000 years.

As a bit of a warning to those that can't possibly think outside their box, can't otherwise violate their cult "nondisclosure" policy, as for those sorts of individuals there's absolutely no hope nor redemption, as for no matters what's been possible, and of regardless of what those laws of physics might have to say on behalf of other life NOT as we know it, these anti-everything fools are merely following their Borg collective programming, to their death if need be, and unfortunately, to the degradation and demise of anyone getting in their way of snookering the world. In other words, lies beget liars and, in politics as in the world of publicly funded physics, wherever there's such a money trail and/or of benefits too being had, there's a keen focus upon hiring and/or funding only those folks that can be entrusted to continue lying on behalf of the status quo (the nearly all arian white club of "all for one and one for all").

Lets just presume that the absolute closest Sirius ever gets itself to our solar system is the 0.01 ly, and that of their loop or orbit route offered Sirius a plausible near fly-by as for a working timeline that's within this range/zone of up to +/- 1 ly from our solar sustem, merging down to the otherwise absolute least (0.01 ly) distance, of which then suggest an overall maximum travel of this Sirius timeline being worth roughly 2 ly.

If sirius was trekking itself along their 110,000 year pathway, at the rate of 80.5 km/s, I believe that offers 7450 Earth years worth of being within this +/- 1 ly zone, though we might have to reconsider that of even their best technology effort at to/from commuting was utilizing at best 30,000 km/s (0.1 ly) capability, thus a somewhat more reasonable window of opportunity falls down to the capability of +/- 0.1 ly, and of a Earthly capable visitation timeline of 745 years worth of encounter, which obviously doesn't give all that much room for terraforming error, but none the less, for that of a sufficiently advanced race, perhaps a 745 year window of opportunity could have done the trick, unless something goes terribly wrong.

Gee whiz; what could possibly go wrong, much less with doing three entirely different planets at the same time?

One of those nagging if not pestering thoughts has always been; what if we were like those smart souls from Sirius, going about attempting our hand at this sort of terraforming task, assuming that we'd mastered at least the rate of traveling about at 30,000 km/s, thus being our maximum 0.1 ly commute from Sirius (one-way) was at most going to take us roughly a full year (give or take the 80.5 km/sec velocity factor of Sirius), and obviously lesser time as our mutual junctions closed in upon the 0.01 ly differential.

As for offering some reassurance of providing our remote teams with a survivable outpost (pitstop) that wasn't directly associated with either of the three planets we had intended to terraform, it seems like it would have been a damn good notion as to placing an unusually stable moon about the central planet, though of a moon having a thermal nuclear core of energy reserves as to best accommodate our terraforming teams. In this manner the three worlds of a given solar system (such as this solar system) could have been safely tampered with, and otherwise manipulated with the least possible contact and/or contamination by our own kind, as well as for our teams having sort of camped out on a reliable home away from home, that wasn't going to be nearly as difficult for ourselves and items being delivered to/from in the first place, and/or for subsequently extracting everything for the eventual return flights back home. In other words, making a crew change at intervals of 25 or so years becomes entirely doable, mostly for our physiology benefits and of certain other needs that might be in order, such as retirement, though some of the most dedicated folks might pull a double shift, and/or later return for another 25 year stint.

Keeping logistics somewhat further in mind, that most of the bulk substances originating from Sirius/abc are not those having to be deposited onto the moon, but rather established into orbit about whichever intended planet, whereas the terraforming teams stationed onboard their lunar outpost would then go about overseeing those package deliveries, as for perhaps directing their final decent onto the surface, whereas whatever was released and/or having to be transported about the globe for accomplishing their intended goal, this phase would have been at the discretion of the team(s) specifically charged with such responsibilities.

As well accepted by our NASA and their loyal huggers, everyone seems to be aware of, and in reasonable consensus upon the initial difficulties of just getting ourselves to another planet, even though this task is entirely dwarfed by any further notions of having whatever it takes as to getting ourselves back off that other planet, at least with any dignity. In other words, not having to utilize a body bag, like what's most likely going to happen upon Dr. Zubrin's return from Mars.

Thus it seems by having yourself the benefits of delivering and/or creating a sufficiently nearby and relatively low gravity lunar outpost, that's entirely stable, as well as the one and only sifnificant object orbiting the mid planet having a synchronized rotation, and thereby actually performing as a rather unique observational platform, that's also providing an essential home sweet home remote abode for all of your terraforming teams, is a rather grand solution if there ever was. As then, only when and if it's absolutely necessary for making personal visitations onto the surface of Mars, Earth or Venus, not only is your to/from commute travel time a snap but, you'll never have to spend the night away from your underground lunar laboratory and adjoining lunar abode. Therefore, if the environmental conditions on your planet aren't right, and/or something you had previously created for that planet was attempting to eat you, lo and behold, you would just pack everything up and leave on your fleet scout ship (offering perhaps 3,000 km/s), and that would be that.

Without any doubt, this is about as far outside the box as I've managed to get myself, thus as such complex plots thicken as to how certain terraforming sorts of things could have been done, it seems just a plausible for this one to fly as not. Obviously I've left out numerous details, and I haven't covered many issues that would seriously have nailed our hides to the barn, at least with any respect to what's currently accepted or even on the books for suggesting upon future potentials, of ways of doing such terraforming things, of which obviously our capabilities are not nearly sufficient nowadays, nor will it likely become doable within the next few decades. Thereby this avenue of terraforming remains for the likes of folks a whole lot smarter than and vastly more capable than us, especially when we'd rather be poking fun at others and/or simply taking further advantage of whatever resources others might have.

Of course, I'm thinking that not every well intended effort at terraforming is going to work as planned, as variables and unknowns are going to impose some degree of risk, if not outright horrifying results. Although, if future missions of longer range capable probes are continued, chances are certainly better off than not for your terraforming workmanship to survive, even though there may eventually come a time when it's apparent that only an entire "RESET" is going to save the day, and after all, the creatures now living on those planets you terraformed were just your petri dish clones of something you felt was necessary, so there's obviously little if anything to being lost if it should become necessary to wipe the slate clean, and attempt to start over, as it certainly would be cruel and immoral to intentionally shift or skew the odds by giving one of your creation groups some technological and/or biological advantage over another. I'm assuming that the "all knowing" God by which Sirius obeys will NOT have been pleased if such terraforming runs itself too far amuck, as I'm assuming that would have been considered sacrilegious.

Perhaps we should try to realize that I'm not the one suggesting anything "Star Wars", as more likely "Star Oops" if you'd honestly consider the sorts of DNA/RNA that's currently running amuck that created the likes of GW Bush and of a few dozen others. In fact, why even give these Sirius folks any benefit of doubt, as these folks could have been the mirror image of "dumb and dumber", which might account for why our Earth has been so screwed up in the first place.

However, this terraforming notion could soon become the very foundation or eventual "road map to peace" of what our NASA and Halburton have been planning all along, with their notions of either terraforming another world for our eventual benefit, and/or simply pillaging and/or harvesting that planet's resources (biological and otherwise) for our immediate benefit, and perhaps as usual regardless of whatever the consequences, just exactly like they've already been doing. Obviously by the sorts of standards of what our administrations have already accomplished (actions speaking far better than words) and/or allowed as far worse atrocities with entire disregard for those consequences, and most recently of our "so what's the difference" policy, one has to wonder what's even better than our indiscriminate open-pit mining and pillaging of some other world?

Here's the other deliveries upon what's new and of what's hot, as offering a bit more context into what my three brain cells can deliver on behalf of Sirius terraforming the likes of Mars, Earth and Venus.
*** https://guthvenus.tripod.com/gv-earth-venus.htm
https://guthvenus.tripod.com/gv-sirius-trek.htm

I was actually re-thinking along the lines of others that actually knew what they were doing, as for creating a sutible world that could have been terraformed into becoming a miniture version of what's survivable within the Sirius group, somewhat like our Venus that's been sufficiently surrounded by such a thick enough atmosphere as to shield out radiation, as well as for fending off all but the largest of meteorites.

Seems as long as there's available energy (the more renewable the better), and the surface environment hasn't become too hot and nasty for the likes of having to utilize the available minerals and composites, that's necessary as to being applied by whatever and/or whomever is situated there, along with evolution/creation selecting upon rational physiology (that alone eliminates humans), and of there being relatively modus applied physics, and of using at least half a brain, almost any village idiot could have been educated as to making a go of it, though not a chance as to being educated by the likes of our resident warlord's "high standards and accountability", as your ass would soon have become grass, as on fire no less, under those pathetic conditions of only becoming dumb and dumber there's not chance in hell of surviving even here on Earth, just looking at what happened to Cathars and of those prisoners of Israel's 6-Day war should have given you a clue.

The capability of focusing energy, namely efficient photons rather than those inefficiencies of electro-magnetics of radio upon a given target, at using lasers of perhaps as tight as 0.05 milliradian seems to beat just about anything radio by leaps and bounds, not to mention being of the most acceptance to the widest possible range of species, as well as intellect. I mean, how smart do you have to be to notice a pattern of illuminations in an otherwise near pitch black environment, though only dimly illuminated by nocturnal standards.

Of folks attempting such efforts with the likes of arousing Venus lizard folk, as for starters I'm of the knowledge that 400~450 nm should best penetrate those clouds by 25%, though thoroughly diverged by the distance and those composite clouds, below which it's crystal clear. Though as for Sirius we could go 350~400 nm if not considerably lower, such as below 200 nm, as our sun creates it's peak energy at roughly 500 nm.

Here's another bigger "what if", that's pertaining to the likes of Sirius taking a fairly long shot at terraforming a few planets.

Lets just presume that the absolute clossest Sirius ever gets itself is the 0.01 ly, and that of the loop or orbit route offered them a plawsable near fly-by working range/zone of up to +/- 1 ly from the otherwise absolute minimal (0.01 ly) distance, which then suggest an overall range of Sirius travel time being worth roughly 2 ly.

If sirius was trekking itself along their pathway at the rate of 80.5 km/s, I believe that offers 7450 years worth of being within this +/- 1 ly zone, though we might have to reconsider that their best effort at to/from commuting was utilizing a 30,000 km/s (0.1 ly) capability, thus a more reasonable window of opportunity falls down to the capability of +/- 0.1 ly, or a Earthly timeline of 745 years worth of encounter, which obviously doesn't give all that much room for terraforming error, but none the less, for a sufficiently advanced race, perhaps 745 years worth could have done the trick, unless something goes terribly wrong.

Gee, what could possibly go wrong, much less with doing three entirely different planets at the same time?

One pestering thought has always been, what if we were those smart souls from Sirius, going about attempting our hand at this sort of task, assuming that we mastered at least the rate of traveling about at 30,000 km/s, thus being our maximum 0.1 ly commute from Sirius (one-way) was going to take roughly a full year (give or take the 80.5 km/sec factor).

In order to offer some reassurance of providing a survivable outpost (pitstop) that wasn't directly associated with either of the three planets that we had intended to terraform, it seems like it would have been a damn good notion as to placing an unusually stable moon about the central planet, though a moon having a thermal nuclear core of energy reserves as to best accommodate our terraforming teams. In this manner the three worlds of a given solar system (such as this solar system) could have been safely tampered with, and otherwise manipulated with the least possible contact and/or contamination by our own kind, as well as for our teams having sort of camped out on a reliable home away from home, that wasn't going to be nearly as difficult for ourselves and items being delivered to in the first place, and/or for subsequently extracting everything for the eventual return flights back home. In other words, making a crew change at least every 25 or so years becomes entirely doable, mostly for our physiology benefits and of certain other needs that might be in order, such as retirement, though some of the most dedicated folks might pull a double shift, and/or later return for another 25 year stint.

Keeping in mind, that most of the bulk substances sent from Sirius/abc are not necessarily those having to be deposited onto the moon, but rather established into orbit about the intended planet, whereas the terraforming teams stationed onboard the moon would then go about overseeing those package deliveries, as for perhaps directing their final decent onto the surface, whereas whatever was released and/or having to be transported about the globe for accomplish their intended goal, this would then be at the discretion of the team(s) charged with such responsibilities.

As well accepted by our NASA and their loyal huggers, everyone seems to be aware of and in reasonable consensus upon the initial difficulties of just getting ourselves to another planet, even though this task is entirely dwarfed by any further notions of having whatever it takes as to getting ourselves back off that other planet, at least with any dignity. In other words, not having to utilize a body bag, like what's most likely going to happed upon Dr. Zubrin's return from Mars.

With out any doubt, this is about as far outside the box as I've managed to get myself, thus as such plots thicken as to how certain terraforming sorts of things could have been done, it seems just a plawsible for this one to fly as not. Obviously I've left out numerous details, and I haven't covered many issues that would seriously have nailed our hides to the barn, at least with any respect to what's currently accepted or even on the books for the future potential of ways of doing things, of which obviously isn't nearly sufficient nowadays, nor will it likely become doable within the next few decades. Thereby this avenue of terraforming remains for the likes of folks a whole lot smarter than us.

Of course, not every well intended effort at terraforming is going to work as planned, as variables and unknowns are going to impose some degree of risk if not outright horrifying results. Although, if future missions of longer range capable probes are continued, the chances are certainly better off than not for your terraforming workmanship to survive, even though there may come a time when it's apparent that only an entire "RESET" is going to save the day, and after all, the creatures now living on those planets you terraformed were just petri dish clones of something you felt was necessary, so there's obviously little if anything to being lost if it should become necessary to wipe the slate clean, and attempt to start over, as it certainly would be cruel and immoral to intentionally shift the odds by give one of your creation groups the technological and/or bilogical advantage over another. I'm assuming that the "all knowing" God by which Sirius obeys will NOT have been pleased if such terraforming runs itself too far amuck, as I'm assuming that would be considered sacrilegious.

Perhaps try to realize that I'm not suggesting anything "Star Wars", as more likely "Star Oops" if you'd honestly consider upon the sorts of DNA/RNA running amuck that created the likes of GW Bush and a few dozen others.

However, this could soon become the very foundation or eventual road map of what our NASA and Halburton have been planning all along, with the notions of either terraforming another world for our eventual benefit, and/or simply pillaging and/or harvesting that planet's resources for our immediate benefit, and perhaps regardless of whatever the consequences. Obviously by the standards of what our administrations have already accomplished and/or allowed far worse things with entire disregard for those consequences, and "so what's the difference", what's even better than our indiscriminate open-pit mining of some other world?

Calling Venus;
If you're perchance the sort of individual that's more interested in the truly honest prospects of our achieving interplanetary communications, as for that relatively simple and efficient quest I've added lots of notions, if not a little too much, into this following page;
https://guthvenus.tripod.com/gv-interplanetary.htm