Brad Guth
2010-09-21 18:43:54 UTC
Contributor “palsing” tells us:
“Captures are possible, of course; many of the solar system's moons,
after all, are captures... but I AM saying that a capture specifically
between Sirius and our solar system is a mathematical impossibility.”
We’ll just have to see about that “mathematical impossibility”,
because to me it honestly doesn’t seem as so insurmountably impossible
for our solar system to have been captured, especially considering the
nearby original mass of <3e37 kg and the fact that we’re still not
headed away from Sirius, and there’s simply no telling where that
Sirius molecular/nebula cloud was to begin with as of 260+ million
years ago.
Not to continually nitpick, however, besides our reddish icy Sedna
there’s 2005-VX3/damocloid(icy asteroid) of 112 km diameter as perhaps
worth at most 1.47e18 kg, that’s still hanging with us all the way out
to 2275.5 AU(3.4e14 m) that’s worth a pathetic tidal radii gravity
binding force of merely 1.71e9 N, and apparently even it’s not going
away from our solar system's tidal radii grip. It seems that’s
representing a current Sirius/XV3 ratio as having nearly 83e6:1
greater tidal radii hold on us, not to mention that we seem to be
headed back towards that drastically down-sized Sirius mass at 7.6 km/
s and unavoidably accelerating, pretty much exactly as any elliptical
Newtonian orbital trek should.
That mass ratio as a offering a gravity binding force and subsequent
tidal capture link between Sol and Sirius used to have something near
4.25e6 fold as much mass as nowadays to work with, and there’s still
no objective way of telling how close we were to begin with.
Ongoing corrections and somewhat better math:
Apparently a stellar and planet producing molecular/nebula cloud
doesn’t get blown away from the initial fusion of its protostar(s) any
too slowly. Instead it’s more likely a soft nova taking place within
the first cloud radii, and as such the initial cloud expansion and the
subsequent 1r exit velocity of <20,000 km/sec could be expected.
For example, the estimated 3e37 kg molecular/nebula cloud that gave
birth to those nearby Sirius protostars of at least 12.5 Ms, likely
had a cloud radii of at least 64 ly, and in order to disperse that
volume of mass within any reasonable amount of time is going to
require that cloud radii to increase by roughly 0.1%/yr, and that’s
worth .064 ly or 6.05e11 km/year, which works out to 19184 km/sec (not
the previous 3000 km/sec that I’d previously suggested).
In order to double that cloud radius from 64 to 128 ly at a starting
velocity of 19,184 km/sec takes roughly another 1500 years as it slows
down, or a thousand years at the same starting velocity. The average
cloud density that needs to include those terrific stellar CMEs is
likely going to become worth 1e4/cm3 of rather nicely heated molecular
plus whatever CME stuff to start off with.
In other words, if using a constant outflux velocity and a million
years after those new stars started pushing away their remainder/
surplus volume of molecular/nebula mass, the radii will have increased
by only 6.4e4 ly (with us pretty much dead center), and when given 260
million years offers 16.64e6 ly as long as the exit velocity remained
unchanged. However, at most the Sirius molecular cloud radii has
likely expanded something less than a million light years out, and
never the less we’re situated pretty much dead center within that
expanding molecular sphere that’s probably making the exact same red-
shifted noise as the CMBR.
At 64 ly to start off with (as if our solar system were situated just
outside of that original molecular/nebula cloud), whereas that’s only
looking at our receiving a thousand fold more proton density and
roughly 32 times the average solar CME velocity that our own sun
tosses at us, and I’d bet that it’s also at the very least twice as
hot and UV saturated as well as representing a sustained molecular
interaction that’s going to affect our terrestrial environment for a
good thousand years.
Perhaps by the time that molecular/nebula cloud doubles its first
radii (2r and 2500 years from the initial stellar fusion kickoff) the
molecular exit velocity will have subsided down to the dull roar of
roughly half of its initial 1r shockwave velocity that took roughly
the first thousand years to initially accomplish, and at 4r could
become half that of the 2r exit velocity due to the core and other
half (1.5e37 kg) portion of molecular/nebula as gravity that’s
directly behind and always working as an unfocused weak force against
cloud expansion, as well as the initial stellar fusion backing off.
This method might suggest as little as having 10000 km/sec available
at 2r, then falling off to 5000 km/sec at 4r, 2500 km/sec at 8r and
only 312 km/sec at 64r (4096 ly).
I’ll likely have to research and run through these numbers a few more
times, as well as having to revise my topic to suit, but you should at
least get the basic gist of what this means and the implications as to
this nearby event and subsequent cosmic evolution having affected our
local environment, starting as of roughly 260 million years ago.
In other words, it’s probably not a coincidence of random happenstance
that Sirius emerged at roughly the exact same time as our global
environment and a few other considerations about our nearby solar
system changed forever.
~ BG
“Captures are possible, of course; many of the solar system's moons,
after all, are captures... but I AM saying that a capture specifically
between Sirius and our solar system is a mathematical impossibility.”
We’ll just have to see about that “mathematical impossibility”,
because to me it honestly doesn’t seem as so insurmountably impossible
for our solar system to have been captured, especially considering the
nearby original mass of <3e37 kg and the fact that we’re still not
headed away from Sirius, and there’s simply no telling where that
Sirius molecular/nebula cloud was to begin with as of 260+ million
years ago.
Not to continually nitpick, however, besides our reddish icy Sedna
there’s 2005-VX3/damocloid(icy asteroid) of 112 km diameter as perhaps
worth at most 1.47e18 kg, that’s still hanging with us all the way out
to 2275.5 AU(3.4e14 m) that’s worth a pathetic tidal radii gravity
binding force of merely 1.71e9 N, and apparently even it’s not going
away from our solar system's tidal radii grip. It seems that’s
representing a current Sirius/XV3 ratio as having nearly 83e6:1
greater tidal radii hold on us, not to mention that we seem to be
headed back towards that drastically down-sized Sirius mass at 7.6 km/
s and unavoidably accelerating, pretty much exactly as any elliptical
Newtonian orbital trek should.
That mass ratio as a offering a gravity binding force and subsequent
tidal capture link between Sol and Sirius used to have something near
4.25e6 fold as much mass as nowadays to work with, and there’s still
no objective way of telling how close we were to begin with.
Ongoing corrections and somewhat better math:
Apparently a stellar and planet producing molecular/nebula cloud
doesn’t get blown away from the initial fusion of its protostar(s) any
too slowly. Instead it’s more likely a soft nova taking place within
the first cloud radii, and as such the initial cloud expansion and the
subsequent 1r exit velocity of <20,000 km/sec could be expected.
For example, the estimated 3e37 kg molecular/nebula cloud that gave
birth to those nearby Sirius protostars of at least 12.5 Ms, likely
had a cloud radii of at least 64 ly, and in order to disperse that
volume of mass within any reasonable amount of time is going to
require that cloud radii to increase by roughly 0.1%/yr, and that’s
worth .064 ly or 6.05e11 km/year, which works out to 19184 km/sec (not
the previous 3000 km/sec that I’d previously suggested).
In order to double that cloud radius from 64 to 128 ly at a starting
velocity of 19,184 km/sec takes roughly another 1500 years as it slows
down, or a thousand years at the same starting velocity. The average
cloud density that needs to include those terrific stellar CMEs is
likely going to become worth 1e4/cm3 of rather nicely heated molecular
plus whatever CME stuff to start off with.
In other words, if using a constant outflux velocity and a million
years after those new stars started pushing away their remainder/
surplus volume of molecular/nebula mass, the radii will have increased
by only 6.4e4 ly (with us pretty much dead center), and when given 260
million years offers 16.64e6 ly as long as the exit velocity remained
unchanged. However, at most the Sirius molecular cloud radii has
likely expanded something less than a million light years out, and
never the less we’re situated pretty much dead center within that
expanding molecular sphere that’s probably making the exact same red-
shifted noise as the CMBR.
At 64 ly to start off with (as if our solar system were situated just
outside of that original molecular/nebula cloud), whereas that’s only
looking at our receiving a thousand fold more proton density and
roughly 32 times the average solar CME velocity that our own sun
tosses at us, and I’d bet that it’s also at the very least twice as
hot and UV saturated as well as representing a sustained molecular
interaction that’s going to affect our terrestrial environment for a
good thousand years.
Perhaps by the time that molecular/nebula cloud doubles its first
radii (2r and 2500 years from the initial stellar fusion kickoff) the
molecular exit velocity will have subsided down to the dull roar of
roughly half of its initial 1r shockwave velocity that took roughly
the first thousand years to initially accomplish, and at 4r could
become half that of the 2r exit velocity due to the core and other
half (1.5e37 kg) portion of molecular/nebula as gravity that’s
directly behind and always working as an unfocused weak force against
cloud expansion, as well as the initial stellar fusion backing off.
This method might suggest as little as having 10000 km/sec available
at 2r, then falling off to 5000 km/sec at 4r, 2500 km/sec at 8r and
only 312 km/sec at 64r (4096 ly).
I’ll likely have to research and run through these numbers a few more
times, as well as having to revise my topic to suit, but you should at
least get the basic gist of what this means and the implications as to
this nearby event and subsequent cosmic evolution having affected our
local environment, starting as of roughly 260 million years ago.
In other words, it’s probably not a coincidence of random happenstance
that Sirius emerged at roughly the exact same time as our global
environment and a few other considerations about our nearby solar
system changed forever.
~ BG