In his book Alien Oceans: The Search for Life in the Depths of Space, Kevin Peter Hand takes what scientists have discovered about Earth’s oceans to imagine what kind of life might lurk in the vast oceans that lie beneath the icy crusts of the moons of Jupiter and Saturn. Hand, a planetary scientist at NASA’s Jet Propulsion Laboratory, spoke with Air & Space senior associate editor Diane Tedeschi in July.

To read more, click here.