Why would god only creat life on earth?

So i was just thinking if there was other life besides us hear in space on this planet. Think about it! space never ends and there are a bunch of other universes beside the milkyway and there are about a trillion other planets out there why would earth be the only one that contains life on it? I am very confused on this question ! Why would god make a billion other planes and other unviverses and earth be the only planet that has life on it? Please answer seriously