Regions of the Universe containing very few or no galaxies—known as voids—can help measure cosmic expansion with much greater precision than before, according to new research.
![](https://3c1703fe8d.site.internapcdn.net/newman/csz/news/tmb/2019/5d25e59957a71.jpg)
Source:
https://phys.org/news/2019-07-holes-universe-sharpen-cosmic.html