Caleb Scharf
Scientist and Writer, Columbia University, New York

Caleb Scharf is director of astrobiology at Columbia University in New York. He is the author of Extrasolar Planets and Astrobiology (2009), which won the Chambliss Astronomical Writing Award. His latest book is The Zoomable Universe: An Epic Tour Through Cosmic Scale, from Almost Everything to Nearly Nothing (2017).

Written by Caleb Scharf

The Little Sombrero galaxy NGC 7814. Photo courtesy ESA/Hubble & NASA

Essay/
Space exploration
What if ET is an AI?

After centuries searching for extraterrestrial life, we might find that first contact is not with organic creatures at all

Caleb Scharf

Photo by Cultura/Gallery Stock

Essay/
Biology
Where do minds belong?

Intelligence could have been moving back and forth between biological beings and machine receptacles for aeons

Caleb Scharf

The eXtreme Deep Field, or XDF. The photo was assembled by combining 10 years of NASA Hubble Space Telescope photographs taken of a patch of sky at the center of the original Hubble Ultra Deep Field and was our deepest view into the universe. Photo by NASA

Essay/
Astronomy
Are we alone?

The universe seems to be bursting with planets, and this is profoundly important — but not in the way we might expect

Caleb Scharf

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