mariya, it is my humble advice to u,
Don't waste ur energies, while thinking on such type of points,

how these earths and skies was created, God knows better, no one can even imagine it,, U r in this world, so think about this world.

U can think about other worlds, and Question like this "what was created first, if u have resources for it, like NASA libortaries,,
Other wise these Question are beyond, human sense, and there is not any logical conclusion of these Question..