Two Unusual Galaxies Shake Up the Dark Matter Debate, Again

When it comes to the nature of dark matter astronomers are still largely, well, in the dark. The existence of this mysterious substance was hypothesized more than forty years ago to explain discrepancies in the calculations of how galaxies ought to behave, based on their mass, and what was actually observed. In short, it seemed like mass was missing.

Learn more about your ad choices. Visit podcastchoices.com/adchoices