What is a galaxy? That's a surprisingly difficult question to answer

What is a galaxy? That's a surprisingly difficult question to answer

Figuring out what really counts as a galaxy could give us insights into dark matter and potentially shake up astrophysics, cosmology and particle physics, says columnist Chanda Prescod-Weinstein

The globular cluster NGC 1850 lies inside the Large Magellanic Cloud, a satellite galaxy of the Milky Way Copyright: NASA, ESA and P. Goudfrooij (Space Telescope Science Institute); Processing: Glad… [+6273 chars]