"Saturn's moon Titan is the optimal location in the solar system for an off-Earth human settlement," researchers Amanda Hendrix from the Planetary Science Institute in Arizona and Yuk Yung from Caltech write in the paper. (Hendrix also penned this blog post on the idea in Scientific American along with author Charles Wohlforth in 2016.) "It has Earth-like qualities and a thick atmosphere that provides shielding from damaging radiation unlike any other solid surface location in the solar system."