What are the two primary, interconnected factors challenging stable planetary systems in globular clusters?
Answer
Extreme stellar density and vast survival timescale.
The core issues preventing long-lived planetary systems are the extreme density of stars, causing gravitational chaos, and the need for these systems to survive for the entire ancient age of the cluster.

Related Questions
What are the two primary, interconnected factors challenging stable planetary systems in globular clusters?How does the average stellar separation in a dense globular cluster core generally compare to that in the quiet suburbs of the Milky Way?What is the primary mechanism described that removes planetary bodies from their host stars in dense clusters?What do simulations suggest about the frequency of disruptive gravitational encounters in the core of a cluster like M13 compared to our solar neighborhood?What secondary problem regarding longevity do globular clusters present for planetary survival?Why might the chemical composition of globular cluster stars hinder initial planet formation?Which observational instrument has been instrumental in searching for transiting planets in globular clusters?What was the primary surprising result from the Hubble observations targeting the cluster 47 Tucanae?How does the effective zone of stability for an Earth-like planet in a cluster core compare to the stability in our Solar System?If a planet were theoretically tossed from one star to another during an encounter in a cluster, what is the general consensus on its subsequent stability?