universetoday.com
Most Distant Galaxy Cluster Discovered - Universe Today
An international team of astronomers have used ESA’s XMM-Newton X-Ray observatory to image the most distant galaxy cluster ever seen. This cluster contains hundreds of galaxies, and is located nearly 10 billion light-years from Earth, so it’s seen when the Universe was less than 4 billion years old. Its existence challenges current theories about galaxy … Continue reading "Most Distant Galaxy Cluster Discovered"