[Haftdrarp]

seems a post or two has been pulled... or maybe I never posted

On Earth there is inertia... apparently.... but really that is friction/gravity etc

Stationary things stay stationary
but moving things don't stay moving

In space nothing is stationary (you may say "at rest", whatever that means )
everything is moving and stays moving

so the definition of inertia is anthropogenic, useful on Earth... ???? or archaic ???

From my point of view
inertia is a useless concept

INERTIAL is the term I prefer... such as the motion of the Earth around the Sun, that is inertial motion... Earth is doing what it should given the forces acting upon it,,, and the inertial frame of reference is the Solar System
realising also that the Solar System is also undergoing some sort of other inertial motion in another inertial frame

So for me, inertia is out and inertial is solely confined to the cosmos.. no earthlings allowed LOL

I might add that on Earth there is mass ----> weight

In space mass does not enter into cosmic geometry.

So What is mass ??