The cosmos are filled with roughly Earth-sized exoplanets. Various moons, comets, and planets have stores of water, organic molecules, and amino acids like those that make up life on Earth.

Cathal O’Donnell, a 3D bioprinting researcher at St. Vincent’s Hospital in Melbournethose odds — he argues in The Conversation that the abundance of potentially habitable worlds out there makes the discovery of extraterrestrial life “inevitable and possibly imminent.”