If there is dark matter and if there is a disk of the stuff crossing our orbit in a regular pattern, then there might be something to this hypothesis.
In “Second Genesis” By Donald Moffitt, the extinction of humans on Earth (and 3 subsequent species) is linked to a rotating set of arms in the Milky Way that kill intelligent things off every 37 million or so years.
I think that was called dark matter.
But the book is definitely heavy on the physics.
The book and its predecessor definitely gets points for ULTRA long time span, via slower than light travel and ultimately a 100 million year history.
“If there is dark matter and if there is a disk of the stuff crossing our orbit in a regular pattern, then there might be something to this hypothesis.”
Calling her proposal a hypothesis is extremely generous. It is based on nothing but her imagination. Furthermore WHY she has chosen to propose this is a mystery. Are there no KNOWN and understood mechanisms to explain this? Its well understood that a planet, comet, or other large body passing by an object can change its trajectory. Its observable and testable. Why invoke dark matter? Why suggest it has anything to do with a specific event such as dinosaur extinction? Its bad science fiction.