As our ability to detect smaller extrasolar planets gets better, we’re finding that our galaxy “teems” with Earthlike planets.
The Hubble Space Telescope has discovered a trove of fast-moving “candidate” planets in a narrow region near the very center of the Milky Way, and astronomers say there must be billions more of them — including many like Earth that orbit their suns in so-called “habitable” zones.
I’m willing to bet that few of them are inhabited by aliens who look just exactly like humans except for forehead ridges or pointy ears, though.