Earth about four billion years ago, and the settings where life's chemistry could have begun. With so many partly isolated environments, each could have settled on a different hand, which is why a homochiral pond is a different question from a homochiral planet.

The Loop and the Silence

Science and Technology /

The Loop and the Silence Dr. Celia Blanco. Photo courtesy of Celia Blanco Astrobiologist Celia Blanco on how life begins, how civilizations last, and why a quiet galaxy may not be an empty one Editor’s Note Celia Blanco’s research reaches across two distant scales in the story of life. She asks how the first molecules

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