Questions for “Our feverish universe is getting hotter every day”
![hot gas in a galaxy cluster](https://www.snexplores.org/wp-content/uploads/2021/01/1440_cosmic_warming_feat-1030x580.jpg)
Hot gas in a galaxy cluster appears green in this image of the Abell 520 cluster taken by many telescopes. The cluster is about 2.4 billion light-years away. A new study shows hot gas like this has been getting hotter as the universe ages.
NASA, ESA, CFHT, CXO, M.J. Jee/University of California Davis, A. Mahdavi/San Francisco State University