In 2007, Hanny van Arkel noticed a blue blob next to a galaxy. Eight years later, scientists are still trying to figure out how it got there.
Hosted by: Caitlin Hofmeister
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Sources:
Galaxy Zoo: http://www.galaxyzoo.org/
http://hannysvoorwerp.zooniverse.org/sandbox/Downloads/VoorwerpComic.pdf
http://mnras.oxfordjournals.org/content/420/1/878.full
http://www.hannysvoorwerp.com/?page_id=8
http://hubblesite.org/newscenter/archive/releases/2015/13/image/a/
http://arxiv.org/abs/1408.5159
http://arxiv.org/pdf/1101.2784.pdf
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