Happy face lens. Right below a very interesting collision

https://www.legacysurvey.org//viewer/?ra=198.5733&dec=0.3073&layer=hsc-dr2&zoom=16

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I dismissed that as unlikely to be a lens owing to the absence of a large enough mass concentration to cause one. It is most likely an arc of starburst activity in the debris trail from a galaxy collision, possibly between the two closest galaxies in the image.

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