Oct 4, 2025
In this episode, friend of the show Geriant Lewis, Professor of
Astrophysics at the Sydney Institute for Astronomy within the
University of Sydney, joins us to unpack a fascinating New
Scientist article theorising on how a strange line of dwarf
galaxies may have formed.
We explore how high-speed collisions between dwarf galaxies can
scatter gas and stars across space, sometimes giving rise to
entirely new tidal galaxies. Geraint explains the latest thinking
on where these dwarf galaxies come from, what makes a galaxy
“relaxed” or “unrelated,” and how these cosmic smash-ups might even
shed light on one of the biggest mysteries in physics: the true
nature of dark matter.
www.geraintflewis.com/
Linkedin: Geriant Lewis
Bluesky: cosmic_horizons
