The Book that tells me about the GOD that I believe in has stated:
...created the heavenS and THE earth.
I'd hope that if other 'earths' were created as well, there would be some mention of it.
John 1:3 King James Bible
All things were made by him; and without him was not any thing made that was made.
If it were relevant to what we need to know for salvation, I’m sure it would have been included.
It astounds me the number of things people think should have been included in Scripture.
Isn’t the Bible already long enough for some folks?