UNKNOWN OBJECT HEADING THIS WAY!!! UPDATE DEC8 2012!!! OH SHIT!!!

Astro, as the sun has barycenters of the planets, do the planets have barycenters of the sun and the other planets? Do the planets also have barycenters from their moons? My question goes on and on, does Sirius have barycenters from our sun? Does galactic center have barycenters of all other galaxies? Thanks

There is a solar system barycenter shared by the sun and the planets. Each planet has a barycenter with its moon or moons in the same way the sun does with its planets. We're not orbiting Sirius so your question is a bit nonsensical there. You could define a point somewhere between our sun and Sirius where the gravitational effect of the sun and Sirius are equal, but the effect of the gravity of both of them would be extremely minor at that distance and an object's motion would probably be dictated more by galactic tidal forces and so forth. It's therefore not a meaningful point except to simply tell you that if you continue heading towards one star or the other, you will start to experience more gravity from the star you're traveling to than the star you're heading away from, though that gravity probably won't really matter till you get significantly closer.

You could theoretically define such a point between ANY two stars, even if they're on opposite sides of the galaxy, but when you get there you'll find that it won't matter in the least because the stars and mass in the area that are much closer to you will be all that actually matters in determining your trajectory. The "barycenter" you defined when you set out on your journey will not matter at all. The same applies on a galactic scale as well; while the milky way galaxy has a barycenter with the Magellanic clouds and other minor dwarf galaxies that orbit our galaxy, you could define a meaningless barycenter between our galaxy and ANY other galaxy. It simply won't be useful, whereas a barycenter defined with the dwarf galaxies that actually orbit our galaxy would actually be meaningful.

Last Edited by Dr. Astro on 12/09/2012 07:35 PM

Enhanced versions of STEREO Behind HI2 images showing the comet:

Wow. A lost comet :) That's freaking cool!

It is irrelevant what it is, and there is NOTHING you can do to defend yourselves.

The majority of humans can not even go one day without murdering each other.

Fools...

The majority? I must be in the minority then because I didn't kill anyone today.

Which minority?

Hey! Go Astro! I didn't kill anybody today either!!!! :-D

What about yesterday

Welllll....You know...don't harp on the past!!!!!

I am interested, but I am so lost on this thread. Could someone please give me a short break down of what the heck is going on in here?

I think I summarize it pretty well here:

Thanks, but strange....did you take over for the OP?

[link to www.youtube.com]

good to see you again astro, always nice to have someone around who actually knows things.

Did anyone notice the illuminati hand sign he through up in the beginning at 00:55

There is something strange going on in this thread.
Astro has high-jacked OP's thread. And people are posting a bunch of shill video's

I'm out of here sheeple something doesn't feel right.

Excuse me? I didn't hijack shit! I properly identified and explained the object the OP's thread is all about!