Scientists have confirmed that the tail of hot gas behind a galaxy group is the longest yet seen. NGC 4839 is plunging into the Coma Cluster and leaving a streak that glows in X-rays. A new study using NASA’s Chandra X-ray Observatory confirmed the extraordinary length (1.5 million light-years) of the tail. This result is helping astronomers learn more about how galaxy clusters grow to their enormous sizes.
For more information: https://chandra.harvard.edu/photo/2023/ngc4839/