Bradbury's four compositions are titled:
GROUND ZERO (THE ATOMIC MONSTER)
ATOMIC MONSTER
ATOMIC MONSTER
and
IT CAME FROM OUTER SPACE

Other titles kicked around by Universal were FROM OUT OF THIS WORLD, THE MAN FROM OUTER SPACE and THE STRANGERS FROM OUTER SPACE. I've never been able to find any evidence that anybody ever called it THE METEOR except Bradbury -- but only in conversation, not on a single cover of anything he wrote.