Actually that's a great point.crazy, huh?
if theres life on those planets, i wonder if they know about the UFO that has spotted them
Keep in mind, 'earth-like' in this article means 'roughly the same size'. Consider how Earth-like Mars, Venus, Mercury, or any of the larger moons in the solar system are, and that should give you an idea of how likely it is that these planets are habitable.