Many lines of evidence in modern physics indicate that 85% of all matter in the universe is invisible because it doesn't interact with light, and only weakly interacts with the matter we know. However, we have only hypotheses as to what this dark matter is composed of. This month for the science ramble, let’s look at how the study of fast galactic collisions, which separate dark matter from ordinary matter, can help physicists find the answer.

Further resources

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The paper covered in this episode: https://www.nature.com/articles/s41586-022-04665-6

An accessible article about dark matter: https://www.space.com/20930-dark-matter.html