Tuesday, 10 February 2015

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

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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.

via Science Daily

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