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Caleb Scharf

Caleb Scharf is an astrobiologist, author, and recipient of the 2022 Carl Sagan Medal. His latest book is The Giant Leap: Why Space is the Next Frontier in the Evolution of Life.

A Wrinkle in Nature Could Lead to Alien Life

There may be more than one way to tune a universe for life.

April 21, 2021

The Alien-Haunted World

Are space scientists too conservative and close-minded about the possibility that ET exists?

February 14, 2021

Who Said Nobody Read Isaac Newton?

It’s a myth that legendary works in science aren’t read.

January 20, 2021

We Never Know Exactly Where We’re Going in Outer Space

Adventures in space travel remind us how imprecisely we measure reality.

November 4, 2020

Take Our Virtual Trip to Mars

See where NASA’s Mars 2020 mission will go and what it may find.

September 1, 2020

How Life Could Continue to Evolve

On the origin of an interstellar species.

August 12, 2020

Mars Is a Second-Rate Backup Plan

On the red planet, existential threats abound.

July 15, 2020

The Trouble with Counting Alien Civilizations

Life on Earth is a sketchy guide to intelligent life in the cosmos.

June 24, 2020

The Selfish Dataome

Does the data we produce serve us, or vice versa?

October 24, 2018