https://phys.org/news/2018-07-alien-life-moons.html

"So far, the search for habitable worlds has been focused primarily on finding Earth-like planets in the habitable zone of their star, but this is not the only type of world on which we might find habitable conditions," says Michelle Hill, a student from the University of Southern Queensland who led the new study.

Moons from planets like Jupiter and Saturn are also good places to look for life. And why not? Even our own Moon could host human life one day.