NASAのインスタグラム(nasa) - 4月4日 02時50分

This is a Hubble Space Telescope image of the most massive cluster of galaxies ever seen to exist when the universe was just half of its current age of 13.8 billion years. The cluster contains several hundred galaxies swarming around under a collective gravitational pull. The total mass of the cluster, as refined in new Hubble measurements, is estimated to weigh as much as 1 million billion stars like our Sun (about a million times the mass of our own Milky Way galaxy) – though most of the mass is hidden away as dark matter. The location of the dark matter is mapped out in the blue overlay. Because dark matter doesn’t emit any radiation, Hubble astronomers instead precisely measure how its gravity warps the images of far background galaxies like a funhouse mirror. This allowed them to come up with a mass estimate for the cluster. The cluster was nicknamed El Gordo (Spanish for “the fat one”) in 2012 when X-ray observations and kinematic studies first suggested it was unusually massive for the time in the early universe when it existed. The cluster may be the result of two smaller galaxy clusters colliding.

Credit: NASA, ESA, and J. Jee (University of California, Davis)
#hubble #hst #nasa #space #universe #galaxycluster #galaxy #galaxies #telescope

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