We spoke with Neil deGrasse Tyson about his new Q&A book "Just Visiting This Planet: Further Scientific Adventures of Merlin From Omniscia" arriving on Oct. 21, 2025.
On the surface of it, Earth and Saturn's moon Titan are wildly different from one another. Earth is temperate and warmed by the Sun, liquid water flows across its surface, and life pervades its opulent biosphere. Titan is beyond the reach of the Sun's warmth, is frigid and lifeless, and orbits a gas giant that is also lifeless.

