galaxy clusters – Astronomy Now

Webb observes menagerie of lensed galaxies behind ‘El Gordo’ cluster

2 August 2023 Astronomy Now

Webb peers into a massive galaxy cluster and finds a stunning menagerie of gravitationally lensed background galaxies from earlier epochs, again revealing the power of the telescope’s infrared vision.

Galaxy cluster warps space, magnifying more distant galaxies

19 May 2021 Astronomy Now

The combined gravity of a remote galaxy cluster warps the space around it and brings the distorted shapes of background galaxies into view.

Four galaxy clusters merging in colossal collision

31 October 2019 Astronomy Now

Astronomers have caught four galaxy clusters in the process of merging, a collision expected to eventually form one of the most massive objects in the universe.

Infant galactic supercluster found in early universe

18 October 2018 Astronomy Now

Astronomers have found a proto-supercluster of galaxies in the very early universe, the most massive structure yet found in the immediate aftermath of the Big Bang.

Galaxies leave a trail as they plunge into massive cluster

28 September 2018 Astronomy Now

NASA’s Chandra X-ray Observatory captures a detailed view showing a small group of galaxies being pulled into a massive galactic cluster trailing a long stream of hot gas in their wake.

Hundreds of galaxies hidden in quasar’s 46-billion-sun glare

17 August 2018 Astronomy Now

Astronomers discover a huge cluster of galaxies ‘hidden in plain sight’ in the glare of a quasar and its voracious central black hole, raising the possibility the universe contains more mass than previously suspected

Hubble discovers ‘wobbling galaxies’

26 October 2017 Astronomy Now

Using the Hubble Space Telescope, astronomers have discovered that the brightest galaxies within galaxy clusters “wobble” relative to the cluster’s centre of mass.

A lot of galaxies need guarding in this Hubble view

8 May 2017 Astronomy Now

Like the quirky characters in the upcoming film Guardians of the Galaxy Vol. 2, NASA’s Hubble Space Telescope has some amazing superpowers, specifically when it comes to observing galaxies across time and space. One stunning example is galaxy cluster Abell 370, which contains a vast assortment of several hundred galaxies tied together by the mutual pull of gravity.

Is dark matter “fuzzy”?

2 May 2017 Astronomy Now

Astronomers have used data from NASA’s Chandra X-ray Observatory to study the properties of dark matter, the mysterious, invisible substance that makes up a majority of matter in the universe. The study, which involves 13 galaxy clusters, explores the possibility that dark matter may be more “fuzzy” than “cold,” perhaps even adding to the complexity surrounding this cosmic conundrum.

Discovering the X-ray treasures in Chandra’s archives

16 October 2016 Astronomy Now

Each year, NASA’s Chandra X-ray Observatory helps celebrate American Archive Month by releasing a collection of images using X-ray data. Each of these six new images — representing just a small fraction of the treasures that reside in Chandra’s unique archive — also includes data from telescopes covering other parts of the electromagnetic spectrum, such as visible and infrared light.