Webgl via Three.js

Should be scaled accurately in xyz, just the size of the objects is exaggerated.

It's a simulation of the number of smaller pieces of debris, but not their specific orbits.

The satellites are drawn much larger than real life. It's negligible.

Yes, setting it to 1 sets the simulation rate at 1 second per second.

If they were drawn actual size, the visualization would not be very interesting, you wouldn't be able to see anything.

Setting the speed to 1 will make the clock tick at 1 second per second.