We Are: Not Alone

If life can exist in a superheated volcanic vent at the bottom of our ocean, why not in the subsurface oceans of (Jupiter’s moon)? Why not in the methane lakes of Titan (Saturn’s largest moon)? Why not in the clouds of Venus , where scientists recently detected phosphine—a gas often produced by anaerobic bacteria?

There are dozens of proposed solutions to this silence, each fascinating in its own right. We Are Not Alone