# As space expands does the density of matter remain same or increase? [duplicate]

I learned that space is always expanding. Even between sun and earth, it's just gravity is stronger.

Imagine space as graph paper and there is a square object that fills it. Space expands, 1x1 cell becomes 2x.

The space expanded not the objects in it. The size of an object remains the same.

So if N amount of matter was present, it's still N. Just that before it was occupying 1 cell now 1/2 cell.

Did the density of object increase? something changed definitely. If it wasn't density then what changed.

• BTW, gravity is not “getting stronger”. There is no evidence that the gravitational constant $G$ is increasing. I think this misconception may be what is confusing you. – G. Smith Mar 22 '19 at 21:10