On Jun 8, 10:07 am, pnals...@gmail.com wrote:
> On Jun 7, 11:31 pm, BradGuth  wrote:
>
>
>
> > On Jun 7, 7:56 pm, pnals...@gmail.com wrote:
>
> > > On Jun 7, 6:05 pm, BradGuth  wrote:
>
> > > > As of some odd 250~350 million years ago, Eden/Earth and our entire
> > > > solar system became surrounded and perhaps otherwise cosmic saturated
> > > > within the exact same molecular cloud that gave birth to the massive
> > > > and extremely vibrant Sirius star/solar system.  Yet for some odd anti-
> > > > disclosure reason this doesn’t seem to bother anyone of any
> > > > astrophysics and astronomy observationology expertise...
>
> > > ***********
>
> > > Once again, you sure can go on and on about things you know
> > > absolutely
> > > nothing about. We already went over all of this back in early April.
>
> > > Sirius and its single companion are approaching earth at about 9 km/
> > > sec, and in 200K years they will be making their closest approach to
> > > earth. Doing the simple math, when that system formed it was about
> > > 100 light years away from our solar system. It did NOT form anywhere
> > > near the earth. Ergo, the cloud it formed from was not anywhere near
> > > the earth then, either.
>
> > > You can Google up this same information for yourself, there is no need
> > > to take my word for it...
>
> > > \Paul A
>
> > So once again, according to your purely subjective mindset is where
> > nothing is in orbit around anything, or much less encounters anything,
> > and all that's Sirius is just a weird kind of rogue cosmic thing that
> > just happened somewhere far, far away, and for no apparent reason came
> > nearly to a stop at its current location as we pass safely in the
> > night (so to speak).
>
> > That must be why its horrific molecular cloud is also no where in
> > sight.  How interesting and how otherwise absolutely pathetic at the
> > same time, that Sirius would migrate in one direction and its
> > molecular cloud of birth took off at a much higher velocity in the
> > opposite direction.
>
> > Are you for real?
>
> > Do you per chance have the 500 million year trek of that molecular
> > cloud and the subsequent stellar birth and proper motion of Sirius
> > plotted for us?  Does anyone?
>
> >  ~ BG
>
> You can sure jump to conclusions in a hurry, can't you?

Conclusion Guth is always ready with a loose cannon or two.

>
> I don't remember stating that nothing was in orbit around anything,
> and I'm not resorting to speculation, I believe you have the corner on
> that market.

My speculation as to the whereabouts of the original Sirius star/solar
system, and of its impressive molecular cloud of charged hydrogen,
helium and a variety of other elements is at least honestly suggesting
that folks claiming to know so much as a matter of fact, really do
not.

>
> There is nothing rogue about the Sirius system, it is a usual and
> customary star system, just like billions of others. The Sirius system
> has NOT come to nearly a stop in its current location, it is still
> approaching us at about 9km/sec and will not be at its closest
> approach for another 200K years, and then it will be moving away from
> us. What is so hard to understand about this? Virtually everything out
> there is moving either towards us or away from us at some speed.

How close did we get the previous time, and of each one before that?

>
> I know nothing of the specific cloud from which Sirius formed, but I
> do know that most stars form in clusters, having condensed from a dust
> cloud, and that when the young stars first start their nuclear fusion,
> their radiation pressure fairly quickly dissipates the reminder of the
> cloud. Every time you view an older open cluster you can be pretty
> sure that at some time in the past it had a nebula around it which has
> now been pushed out into interstellar space.

I agree that the birth of a 12 solar mass star/solar system pushed
the vast bulk of its dust/molecular cloud away, and that unavoidably
we were caught within that process because of being so nearby.  Even
within 100 light years is nearby for such a cloud with perhaps <500
light year radius to start with.

99.99% of the Sirius molecular mass is still out there, and most
likely we've only recently (as of 250~350 million years) passed
through it, and/or it's still surrounding us and Sirius.

>
> Of course, you can also find open clusters that are still surrounded
> by most of the cloud from which they formed, M-42 in Orion is a
> perfect example, as is M-8 in Sagittarius, and many, many others. In
> these you can clearly see stars at all levels of formation, from
> proplyds to full-blown giants. Do some reading here;
>
> http://apod.nasa.gov/apod/ap961017.html

Thanks, I'll do just that.

btw, it looks like there's one black hole emerging in that image
"ap961017.html"

>
> Understand that at some time way in the future there will be no Orion
> Nebula, M-42 will only refer to a star cluster, and that at another
> time way, way in the future that cluster will have evaporated, its
> stars having wandered away from each other, leaving no trace of its
> existence.
>
> \Paul A

So, you're saying that gravity is what primarily creates stars and
gravity is also what keeps stars (regardless of however near one
another) apart?

Somewhat related:  Dark Matter Halo Simulation (looks damn big)
 http://en.wikipedia.org/wiki/Dark_matter_halo

What was the initial Sirius ABC combined solar wind maximum density
and velocity (say for the first thousand or million years when it was
new and really going to town, so to speak)?

How soon after the fairly recent stellar birth of Sirius B do whatever
planets and moons form?

Whatever happened to those Sirius planets and their moons? (only
Sirius C seems to be sticking around, and it's somewhat stealth/
invisible)

 ~ BG