purplecat: Hand Drawn picture of a Toy Cat (Default)
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Explanation: What are the unusual spots surrounding that galaxy? They are all images of the same supernova. For the first time, a single supernova explosion has been seen split into multiple images by the gravitational lens deflections of intervening masses. In this case the masses are a large galaxy and its home galaxy cluster. The featured image was captured last November by the Earth-orbiting Hubble Space Telescope. The yellow-hued quadruply-imaged Supernova Refsdal occurred in the early universe far behind the cluster. Measuring the locations and time-delays between the supernova images should allow astrophysicists to recover the amount of dark matter in the galaxy and cluster. With patience and luck, a fifth image of the supernova will also be recovered nearby in the next few years.

Follow this link for the full detail.

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Date: 2015-03-10 08:29 pm (UTC)
From: [identity profile] daniel-saunders.livejournal.com
This picture is, indeed, cool, but my brain spoiled it for me by starting to play the early eighties Doctor Who theme over it...

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Date: 2015-03-11 09:08 am (UTC)
From: [identity profile] louisedennis.livejournal.com
It's always a bit difficult that most of these images are visualisations of data, rather than actual "as if seen with the naked eye" images. It can definitely give some of them a rather artificial look.

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