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Tal Alexander

black hole

Why do we not see midsized black holes in the Universe? 

A small black hole gains mass: Dense cold gas (green) flows toward the center of a stellar cluster (red cross in blue circle) with stars (yellow); the erratic path of the black hole through the gas (black line) is randomized by the surrounding stars

A new model shows how early black holes could have grown to over a billion solar masses

Prof. Tal Alexander

Prof. Tal Alexander has been appointed Head of the Department of Particle Physics and Astrophysics (2012)

Zoloto | Shay Id Alony. Installation, painted wood, 2006
When two black holes get close, what are the chances they will meet and emit gravitational waves?
Stars pulled into the crowded perimeter of a supermassive black hole sometimes collide. Simulation of a collision between two stars.
A ten-year study suggest the mass at the center of the Milky way is a supermassive black hole
Simulation of a collision between two stars. Simulations by Dr. Tal Alexander, Weizmann Institute of Science
The scientists tracked, for the first time, a star completing an orbit around a known unusual source of radiation (a...