The Bible seems to clearly indicate that this earth is the only such place in the universe. Christ came to defeat Satan and destroy his power having consequences for the entire universe. It was to this earth that Satan came to spread his rebellion and on this earth that Christ sacrificed Himself for sin and His resurrection took place. It is on earth that Christ will set up his kingdom and reign for 1,000 years. It is on earth the new Jerusalem descends and mankind enters an eternal state with Christ as its ruler.
Earth is the spiritual battleground for where ones eternal decision takes place.
Convincing as it may seem for life elsewhere one can only come to this conclusion by ignoring the biblical accounts which are meticulous in their detail. This is not a gray area but of utmost importance. It is a decision everyone may have to take sides on sooner than we think. The almighty has already sent his message in the son who came to earth and died for our sins who has become the solution to the human delimma. There is, and always been God, an invisible uncreated spirit who is beyond anything we can fully comprehend.