For over a century, astronomers believed the Andromeda galaxy was on a collision course with the Milky Way, set to merge in 4–5 billion years. Hubble data supported this forecast.

However, a new study—using updated data from Hubble and the Gaia space observatory—suggests the odds of a Milky Way-Andromeda merger are now closer to 50/50.

Guest: Dr. Till Sawala - University Researcher in the Theoretical Extragalactic Astrophysics Group at the University of Helsinki and at the Institute for Computational Cosmology at Durham University

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