the core of the earth has never been found
Mercury has the lack of oxygen and humans.
because he is not real
If you mean another PLANET - None have been found so far.
The earth cant grow
Because an element in itself is defined as the simplest form of any substance found on earth. So you cant take a simplest form of a fraction and make it smaller without changing it.
you cant
It cant be weighed
No I cant
you cant
no you cant
cant be found
The mass at the center of the Earth is found at the Earth's core.