As our solar system "orbits" in the Milky Way. Is there any correlation in our position in the orbit to past major meteor, etc, hits on Earth, ie, are there positions in the orbit that are potentialllly more dangerous? If so, when will we next be in that position?

A very small percentage orbits our galaxy in the opposite direction. A larger, but still very small percetage is just passing though our galaxy and likely will not repeat in a billion times a billion years. I suppose someone has attempted such a corelation, by dating meteor crators. My guess is; not reliable as the years from perturbed to impact on Earth is quite variable. Also I get the impression that our galaxy churns such that repeats the next time around are very improbable. Neil

There may be a correlation between comet impacts and the solar system's passage through the plane of the galaxy. It is theorized by some that Oort Cloud comets can be perturbed into the inner solar system by our solar system's passage through the galactic plane. Those who theorize this point to data that shows a periodic rise in the rate of impacts that correlates to the period between galactic plane passages.

Approximately every 30 million years, the sun passes through the galactic plane, major extinction events and impacts can be roughly dated in periods of around 30millon years, so there is a general correlation between passing therough the galactic plane and impact events.

thanks-do we know where we are in the present cycle?

Yes, but we haven't actually confirmed that this correlation is meaningful. We do know where we are in the cycle, but do not actually have a high precision estimate as to the length of the cycle. It is somewhere between 20 and 35 million years for the entire cycle, which involves two passes. There is also some disagreement as to where the danger points are. Some say it is as we pass through the plane, others say it is when we are high or low enough above the plane to not have clouds protecting us from the radiation coming from the center.

It is possible that there is something real going on there, but at least as likely to be meaningless handwaving and bad guesses.

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