Walter Alvarez
Professor of Geology, University of California, Berkeley

Walter Alvarez is professor of geology at the University of California, Berkeley, and is one of the founding members of the International Big History Association. His latest book is A Most Improbable Journey: A Big History of Our Planet and Ourselves (2016)

Written by Walter Alvarez

Potential impacter? A single frame Rosetta navigation camera image of Comet 67P taken on 15 April 2015 from a distance of 162 km. The crescent phase has been rendered in false colours. Photo courtesy ESA/Rosetta/NAVCAM.
Deep time
Laws or comets?

Does history unfold randomly and by chance, or are there underlying patterns and deep connections between its parts?

Walter Alvarez