PhD in astrophysics, currently working at Oberlin College. I study galaxy collisions and write @astroquizzical.

The Universe is: Expanding, cooling, and dark. It starts with a bang! #Cosmology Science writer, astrophysicist, science communicator & NASA columnist.

DIANA CHAPMAN WALSH, Ph.D., president emerita of Wellesley College (1993-2007) has also been a trustee of leading organizations in education and health.