There is no evidence to suggest there is life on other planets. In fact, there is much evidence to prove that some of the planets are without life. Therefore — “in all likelihood” — the earth is the only planet with life.
We know that God made earth suitable to support the life of the man and woman He created. But we do not know why he chose the earth. He could have made another planet suitable to sustain the life of Adam, but He did not. To speculate would be futile.
What we do know is that life on earth is not how God intended it to be. He created all things perfect, but Adam’s sin changed everything. God in His mercy and grace sent Jesus to redeem man and one day He will restore all things to His intended perfection. Do you know Jesus?