Episode 114: The Milky Way’s Dark Matter Twin, with Roberto Abraham

For more info on the podcast, please see our About page.

Feature Guest: Roberto Abraham


Imagine a galaxy that has a similar mass and volume to our own but where somebody turned off most of the stars. Meet Dragonfly 44, the most famous member of a new category of galaxies known as ultra-diffuse. Are they failed galaxies, bits of other galaxies or something even stranger. Today we’re joined at The Star Spot by Professor Roberto Abraham whose team was responsible for the discovery of what’s being dubbed the Milky Way’s Dark Matter Twin.


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Current in Space

The killer asteroid that took out the dinosaurs – and much of life on Earth – came from somewhere in our solar system, and Anuj reports we’ve just identified its home base. Then in case you thought the universe was a big place Tony explains how our observable universe just got a whole lot bigger. And did you know Earth has at least one sidekick? Dave explains how a new mission will help study so-called Trojan asteroids that share a common orbit with our pale blue dot.

About Our Guest

Roberto Abraham is Professor and Associate Chair for Graduate Studies in the Department of Astronomy and Astrophysics at the University of Toronto. He received his PhD from the University of Oxford and then performed post-doctoral work at the Herzberg Institute of Astrophysics and the Institute of Astronomy at Cambridge University. Professor Abraham has been awarded the National Science and Engineering Research Council Steacie Fellowship and is Honorary President of the Royal Astronomical Society of Canada’s Toronto Centre.


Spectroscopic Confirmation of the Existence of Large, Diffuse Galaxies in the Coma Cluster (The Astrophysical Journal Letters)

Dragonfly 44: Ultra-Diffuse Galaxy Made Mostly of Dark Matter (Sci News)

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