[MHGinTN]

I am serious. The lesser diameter is due to less mass. Our iron/nickel liquid core is constantly added to via the solar wind. This causes the core to expand with mass, cracking the surface plates so they adjust for the increased mass in the core.

[gundog]

So, how much mass and diameter has been added in the last 100 million years or so?

[Elsie]

https://www.google.com/search?q=how+does+solar+wind+increase+the+size+of+earth&rlz=1C1AVNC_enUS560US607&oq=how+does+solar+wind+increase+the+size+of+earth&aqs=chrome..69i57.12391j0j4&sourceid=chrome&ie=UTF-8