Do Classical Physics Still Have Unsolved Problems?

[BWV]

Are there any? This Wikipedia article
https://en.m.wikipedia.org/wiki/List_of_unsolved_problems_in_physics

Only lists one under classical mechanics:

• Singular trajectories in the Newtonian N-body problem: Does the set of initial conditions for which particles that undergo near-collisions gain infinite speed in finite time have measurezero? This is known to be the case when N ≤ 4, but the question remains open for larger N.[58][59]

 

[boneh3ad]

First, a lot of the items in that list would rightly fit into multiple categories. Turbulence, for example, could certainly fit under classical physics but is listed under condensed matter physics.

Second, a Wikipedia list should not be considered definitive by any stretch of the imagination.

 

[BWV]

I know, which is why I asked the question - was curious.

 

[vanhees71]

Charged point particles are still not well defined, but that problem is solved at least partiall and "for all practical purposes" by QED.