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Second, the distribution of meteors resulting from comets is highly non-uniform around the earth's orbit, while the particles which cause the zodical light must be uniformly distributed.Lastly, and most importantly, the theory that the particle supply is constantly being replenished must make another assumption: that the rates of supply and of destruction into the sun are roughly equal.A couple of notes: for most of the arguments, I provide a background in case you or someone who reads the record is not familiar with the subject area.

About 1950, Jan Ort of the Netherlands postulated a cloud of comets orbiting the sun far outside the planets.

Note that, although observed comet orbits are consistent with such a cloud, there is no direct evidence of its existence: the presence of the comet source is derived from the need for such a source in an old universe.

These methods don't assign an exact age; the rates and initial conditions are not exactly known.

However, since the "young" and "old" age ranges differ by 5 1/2 orders of magnitude, it is easy to say which pieces of evidence favor which theory.

By my implication, this indicates that whether the old solar system theory adequately explains observations is also unknown. Presence of small particles in the solar system This is an astronomical observation consistent with a young solar system but which, as in the case of comets, requires extra assumptions if the solar system is old.

Because of the forward motion of an object in orbit around the sun, the sun's radition strikes it at an angle and exerts a backwards force. In the case particles on the order of 1 mm or less in diameter, this force degrades the orbit, causing the particle to fall into the sun within thousands to a few million years.

Comets are supposedly diverted from the reservoir by the influence of passing stars.

The question is whether or not enough comets will be supplied by this mechanism to agree with observations.

I've discussed some of this in the newsgroup, but here I'll leave it for the rebuttal phase of the debate.

The arguments I use are of the same basic type as those of the old-earth proponents: extrapolation of present-day trends into the past to determine how long something could have been going on.

I do not claim to be an expert in the fields involved. Short-period comets Short period comets disinagrate rather quickly due to interaction with the sun while in the inner portion of the solar system.

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