Another fact expected in a single sun system is that comets should
come from all directions more or less randomly. But historical comet pattern data shows
comet paths tend to be non-random. Fully 1/3 of 82 long cycle
comets come from a narrow belt.
This could lend support to a binary theory whereby a large, distant
mass disturbs comets. Other scientists have come to a similar conclusion
and some think it may be a 10th planet or failed binary with a large
orbital period. Presumably, they are not aware of the evidence to
indicate our Sun is curving through space and that we may be
in an active binary system.
Celestial Body influencing non-random Comet paths.
Matese and Whitmire propose band from Cassiopeia to Polaris.
Murray believes it is in a small patch around Delphinus.
Richard Muller at UC Berkeley also thinks periodic extinctions
may be indicative of a very large cycle binary.