We don't know yet; they haven't happened for us to name them.
Terra Firma.
From the Old English word 'eorthe,' which is also of Germanic origin.
it was name after an acient god it was name after an acient god
All of the planets, except for Earth, were named after Greek and Roman gods and godesses. The name Earth is an English/German name which simply means the ground. It comes from the Old English words...
There are 4 Eras of the Earth. The Precambrian Era, the Paleozoic Era, the Mesozoic Era, and the Cenozoic Era.