A smiling lens: ‘Happy face’ galaxy cluster reveals arcs caused by strong gravitational lensing

An image taken with the NASA/ESA Hubble Space Telescope shows what appears to be a smiling galaxy cluster SDSS J1038+4849. In the case of this “happy face,” the two eyes are very bright galaxies and the misleading smile lines are actually arcs caused by an effect known as strong gravitational lensing. —> Read More Here


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