Dimitar Sasselov Biography

Dimitar Sasselov is an astronomer who explores the interaction between light and matter. He studies among other things extrasolar planets and he's a co-investigator on NASA's Kepler mission which is monitoring 100000 stars in a three-year hunt for exoplanets -- including Jupiter-sized giants. Sasselov watches for exoplanets by looking for transits the act of a planet passing across the face of its star dimming its light and changing its chemical signature. This simple elegant way of searching has led to a bounty of newly discovered planets.
Sasselov is the director of Harvard's Origins of Life Initiative a new interdisciplinary institute that joins biologists chemists and astronomers in searching for the starting points of life on Earth (and possibly elsewhere). What is an astronomer doing looking for the origins of life a question more often asked by biologists? Sasselov suggests that planetary conditions are the seedbed of life; knowing the composition and conditions of a planet will give us clues perhaps as to how life might form there. And as we discover new planets that might host life having a working definition of life will help us screen for possible new forms of it. Other institute members such as biologist George Church and chemist George Whitesides work on the question from other angles looking for (and building) alternative biologies that might fit conditions elsewhere in the universe.

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