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Dark matter
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Caption: This image of the galaxy cluster ZwCl0024+1652 is created using mathematical modelling, together with observations from the Hubble Space Telescope (HST).
The Hubble observations were taken in November 2004 by the Advanced Camera for Surveys (ACS). The exquisite resolution of the ACS, allowed very detailed measurements to be made of the gravitational lensing in the cluster. The blue nebulosity is a superimposed ""map"" of the dark matter distribution in the galaxy cluster and is not visible in the observations, but is a mathematical model created based on the gravitational lensing data.
The ""dark matter ring"" the is present in the image is one of the strongest pieces of evidence to date for the existence of dark matter. Observational data provides evidence that Dark matter makes up about 1/4 of the Universe, and is believed to make up the underlying structure of the cosmos. In addition, a large percentage the mass in galaxies and galaxy clusters is dark matter, which is not visible via direct observations.
Credit: NASA, ESA, M.J. Jee and H. Ford (Johns Hopkins University)
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Glossary Terms:
Dark Matter
Categories:
Cosmology
License: Creative Commons Attribution 4.0 International (CC BY 4.0) Creative Commons Attribution 4.0 International (CC BY 4.0) icons
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