From what I understand, this blue color is caused by a protein. The blue color is in the mucus of the fish. You can actually scrape some of it off and put it in clear water and you'll see the blue pigment.

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I can still remember the instant I realized that one group of features was associated with an older supernova remnant. I think the e-mail I sent around to the other team members had more than twenty exclamation marks in it!

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We were comparing images taken of the same patch of sky at different times to locate brightening or dimming stars. But we saw something we didn't expect - dim streaks of light that moved from year to year.

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