A recent study shows that it is possible for the smaller planets with denser elements could live to fight another day

A recent study shows that it is possible for the smaller planets with denser elements could live to fight another day
The three planets in the conventional habitable zone face the threat of harmful particles and gravitational tugging of the other planets
If the Moon was to make an approach to Earth, at what point would its material begin to be stripped?
It might be a great view, but would it also devastate our planet?
Hint: it doesn’t end well for our planet