Why not? What is the basis for your assertion that great amounts of time are needed to circularize or radically transform orbits? When the fact is that long periods of time make Newtonian orbits unpredictable as per the n-body problem.saul wrote:How could a large moon of Saturn relax to a near circular orbit at 1/9 the distance in less than 1 million years?
How could a large object (Saturn) on a hyperbolic orbit (capture scenario) relax to low-eccentricity near circular orbit in less than a million years?
nick c wrote:Jupiter captured a comet and held it for 12 years as a satellite after which the comet escaped and went back into an orbit of the Sun, and this case is not unique.
nick c wrote:As more and more exo solar systems are discovered we are finding out that our thoughts on what is 'typical' are in need of revision.
saul wrote:Zeus was the son of Kronos, does that mean Jupiter was also a moon of Saturn?
The point is that comets have been observed to be captured and/or change orbits. There are many examples including one that was observed to actually collide with Jupiter. If enough force is applied to any body in orbit around the Sun it can change it's orbit. Millions of years are not required.StalkingGoogle wrote:I really don't think this is a good example of anything except the delusions of astronogers, who didn't observe what you cite, but calculated it (predicting the past) based on models that anyone reading this forum should know are wrong.nick c wrote:Jupiter captured a comet and held it for 12 years as a satellite after which the comet escaped and went back into an orbit of the Sun, and this case is not unique.
I think that the technique for detecting exo planets may not be perfect, but I have not read any criticisms that totally discount the method. Certainly statements as to the mass or size of the planets may be imprecise and have an element of conjecture, but until shown otherwise, I will tentatively accept that exo planets (in close proximity to their primarys) have been discovered.Again, these "exo solar systems" are likely just the delusions of astronogers, who use things like variations in light intensity from a star that changes over hours and days to conclude that there are jupiter-sized planets orbiting stars are absurdly close distances and at preposterous and untenable speeds. Try again here.
nick c wrote:The point is that comets have been observed to be captured and/or change orbits. There are many examples including one that was observed to actually collide with Jupiter. If enough force is applied to any body in orbit around the Sun it can change it's orbit. Millions of years are not required.
nick c wrote:I think that the technique for detecting exo planets may not be perfect, but I have not read any criticisms that totally discount the method. Certainly statements as to the mass or size of the planets may be imprecise and have an element of conjecture, but until shown otherwise, I will tentatively accept that exo planets (in close proximity to their primarys) have been discovered.
Saul said: While gravitational capture occurs, circularization requires frictional / electromagnetic / tidal forces and AFAIK these can only circularize an orbit over enormous time scales.
Lloyd wrote:Orbit CircularizationSaul said: While gravitational capture occurs, circularization requires frictional / electromagnetic / tidal forces and AFAIK these can only circularize an orbit over enormous time scales.
* The Millennium Group had this paper on the subject, http://tmgnow.com/repository/cometary/ori5.html, which calculates that a body with an elliptical orbit near Jupiter would circularize near Venus in 700 years. Their assumptions are likely somewhat different from the TB team's assumptions.
These results assume a resistive force of the form
R = cV/r^2
* Here's Wal's ideas.
Assembling the Solar System, by Wal Thornhill
How the Sun Captured Proto-Saturn
- ... What about the fact that gravitational capture is highly unlikely? ... [...]
- So what I’m suggesting is ... that all of the planets and moons in the solar system did not originate with the Sun; they were captured. Capture of a brown dwarf star begins when the plasma sheaths touch and they “see” each other electrically for the first time. The brown dwarf changes from being an anode in a galactic discharge to a cathode in the Sun’s environment. The adjustment is drastic. The brown dwarf is no longer a star. It becomes the mother of all comets and subject to a steady electrical acceleration toward the Sun. That acceleration will tend to cause the satellites of the brown dwarf to be dislodged from their orbits and, in a dynamic equilibrium, strung out behind in their primary’s cometary wake. [Cardona thinks the Saturn System had that arrangement long before it encountered the Solar System.] Since a comet’s ion tail is a discharge current, the satellites will experience “mega auroras” and devastating interplanetary discharges to varying degrees..
Saul said: Is the proposal an electrostatic interaction between the sun and the captured object? Consider an example of just such an object, the Leonids. The ob[j]ects "strung out" behind the tail of the comet maintain their trajectory and are not rapidly accelerated at just the right moments to obtain a circular orbit.
mharratsc wrote:@ Saul - Why would you specify 'electrostatic in an electrodynamic solar system?
mharratsc wrote:@ Saul - Why would you specify 'electrostatic in an electrodynamic solar system?
saul wrote:Anyway looks like I've been trolled once again
Wal Thornhill has already referred Thompson to low-pressure gas discharge physics as being the appropriate model to use, not simple electrostatics. As a pseudoskeptic, Thompson refuses to address his remarks to this model because it refutes his beliefs and he can‘t find any authority to quote that has ever considered the possibility. In the gas discharge model, interplanetary space is an extensive plasma region termed the 'positive column,‘ which is characterized by almost equal numbers of positive charges (ions) and electrons. The plasma is electrically 'quasi-neutral,‘ like a current-carrying copper wire. And like a copper wire, it is a region with a weak electric field that causes a steady drift of electrons toward the more positive 'sink.‘ (The drift speed of electrons in a current-carrying copper wire is typically measured in cm/hr!) The drift current focused down from the vastness of space powers the Sun.
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