research method (IMAGE)
Caption
In this artistic rendering, light from a distant quasar passes through the halo-like circumgalactic medium of a galaxy on its way to Earth, where it is measured by Hubble's Cosmic Origins Spectrograph to determine the composition of the halo.
Credit: NASA/ESA/A. Field
Image URL: https://hubblesite.org/contents/media/images/2011/37/2930-Image.html?news=true
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NASA/ESA/A. Field
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