Bok
09-30-2015, 08:38 PM
Galaxy clusters are often described by superlatives. After all, they are huge conglomerations of galaxies, hot gas, and dark matter and represent the largest structures in the Universe held together by gravity.
More... (http://www.nasa.gov/mission_pages/chandra/a-fresh-perspective-on-an-extraordinary-cluster-of-galaxies.html)
More... (http://www.nasa.gov/mission_pages/chandra/a-fresh-perspective-on-an-extraordinary-cluster-of-galaxies.html)