PhysicsEngine | Basic physics Engine built with p5 js library

I'm writing an n-body simulation as an exercise in C# using WPF and I ran into what seems like a fundamental design issue with displaying the results of my program.

I have an Entity class, which stores basic information like position, velocity, mass. Then there's the PhysicsEngine class which has an ObservableCollection of Entities and does all the maths. The problem arises when I have to bind the position of the Entities to some graphical elements to show their movement on screen. The distances in space are very big, so I obviously need to process the position information somehow and transform it to screen coordinates. As a quick hack, I added this to the Entity class: