If the earth exploded it would simply be gone. And the space the earth was would fill in instantly with "space". Whatever particles that happened to find a way back to the same spot earth was wouldnt be considered "earth".
That would be like taking a malted milk ball and smashing it with a hammer into dust and placing it back into the same spot before you smashed it and trying to call it a malted milk ball again. No matter how long you let it sit there it wont become a malted milk ball ever again.
you would just be left with the ingredients that at one point in time that were a malted milk ball.
