Jonathan O'Callaghan

Jonathan O'Callaghan is a freelance space and science journalist based in London. He has written for The New York Times, Scientific American, and Wired, among other publications.

Maximilien Brice / CERN

A Dark-Matter Candidate Has Been Hiding in Plain Sight

Axions just make so much sense.
- Jonathan O'Callaghan and Quanta Magazine
- October 25, 2021
New York Public Library

Where Are All the Tiny Black Holes?

The discovery of a celestial “unicorn” that’s just a slim 2.9 solar masses may help unravel a mystery that has long puzzled astronomers.
- Jonathan O'Callaghan and Quanta Magazine
- January 30, 2021

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Jonathan O'Callaghan

A Dark-Matter Candidate Has Been Hiding in Plain Sight

Where Are All the Tiny Black Holes?