Is the Almighty's saying: {And of the earth, their like} [Al-Talaq: 12] referring to the seven layers of the earth, and is the interpretation that there are multiple suns and moons inside the earth's core, and that the earth is hollow and contains seven earths, correct?

The Sharia evidence states that there are seven earths, and scholars have differed in their interpretation. Some believe they are seven spheres, one above the other, and in each earth there are creatures known only to Allah. Others believe they are seven earths, contiguous or overlapping, without separation. Some have suggested that it is one earth divided into seven regions, a view that Ibn Kathir deemed weak.

Some exegetes have mentioned the existence of creatures in these earths, but there is no authentic text to prove this, and what has been narrated is considered part of the unseen, which cannot be definitively asserted.

It is best to believe in what has been established concerning the seven earths and not delve into what has not been proven, for Allah (SWT) did not make us witnesses to the creation of the heavens and the earth.