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so doesn't it stand to reason they are making a celestial U-turn around something similar and at least as large?
To go one step further with that....If some of these are objects we're confident come back again and again...and NASA seems quite confident on that point...then doesn't that suggest relations between our Sun and other large Bodies out there we can't necessarily see let alone understand?
Explaining the extremely long eliptical orbit is a significant problem for astronomy as any solution would have to involve another large body orbiting with Sedna to keep it coming back to Sol every 12,260 years. Sedna's mass in itself cannot sustain its orbital path without major help from what is likely a Brown Dwarf companion star - a twin dark sun as is described throughout ancient lore.
What is it (comets) turn around? Our Sun... forms this side of their round trips...so doesn't it stand to reason they are making a celestial U-turn around something similar and at least as large?
In a gravitational two-body problem with negative energy both bodies follow similar elliptic orbits with the same orbital period around their common barycenter. Source
If some of these are objects we're confident come back again and again... doesn't that suggest relations between our Sun and other large bodies out there we can't necessarily see let alone understand?
How would Sedna or Comet West way out there, a light year away, come back at the proper angles to find our little dot in the vastness?
Where DO all the Comets go?
Originally posted by mikelkhall
Hmm. Never thought about it. Now you have me wondering. I'm sure there are some astronomers here on ATS that can answer this question but now I can't sleep cause I want to know.
Once these comets swing around our sun and go back to their origin what makes them turn back around instead of just keeping on and flying out into eternity?
'Barycentre' here means the centre of gravity of the system. The orbit of the Sun around that centre is tiny, because the Sun is huge compared to the comet. In practice, the Sun stays put (relatively speaking) at one focus of the ellipse the comet describes round it.
The other focus is empty. If there was a third body involved the orbit would cease to be elliptical and become complex, possibly chaotic. Collection of Remarkable 3-Body Motions
Originally posted by Wrabbit2000
...These things have been to places we can't see for hundreds or even thousands of years in some cases. Wouldn't they be picking up material the whole time? So...if or when we can ever get probes or other man-made devices to reliably get to and investigate comets..maybe it represents a shortcut to learning about some very distant places with more than telescopes?
Rosetta's journey takes it out to 5.25 AU (about 790 million kilometres from the Sun). Comet 67P/Churyumov-Gerasimenko has a nucleus about 4 kilometres wide. It orbits around the Sun every 6.6 years, between 186 million kilometres and 857 million kilometres from the Sun.