Ooh, tell me more about the Argentine impact cluster!
50,000 years would be more than enough time for a comet to travel from the purported Oort cloud. Long-period comets (like Kohoutek) have orbital periods in that ballpark.
My view is, the stuff that hits the Earth is mostly nearby, and that the periodicity of impacts is illusory — they happen when they happen, and the greatest threats are near enough for us to identify them and do something about them.
I Googled and first entered “Argentine Impact Craters” where there are a number of interesting listings. I determined that the one I had noticed before was the Campo del Cielo field, so added that to the first title. Here is one of the articles posted there. It seems that testing of burned wood samples under meteorites gives an age of 2200 to 2700 BC, which is about right for Ipuwer’s time.
Have fun checking out these sites, and they also have material related to other parts of South America.
I had to look it up to put this close call of 0.8 light years in perspective. Pluto is about 6 light HOURS away. I’m not sure what the oort cloud is all about, but I’m not sure any disturbances that far away would have had much effect on the earth.
The gravity of the passing sun would have been so small to have had no effect on our solar system.