[RightWhale]

There might be other planets about the size of earth, but none of them, not one, would be like earth in any other way. Don't expect meadow-fresh air, nor mild seasons, nor lake trout.

Suggesting that there could be life out there and planets we might like is like telling Columbus that streets in America are paved with gold. Such an idea might cause exploration and the king to open the kingdom's coffers, but the reality will be far different. False hope. How is the King of Spain doing these days?