There’s basically a hole in the universe a region where there’s much less matter than there should be. And we don’t know why it’s there.

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Sources:
http://mnras.oxfordjournals.org/conte...
http://news.discovery.com/space/galax...
http://www.nrao.edu/pr/2007/coldspot/
http://www.sciencedaily.com/releases/...
http://w.astro.berkeley.edu/~mwhite/bao/
https://newscenter.lbl.gov/2009/10/27...
http://www.newscientist.com/article/m...
http://www.telegraph.co.uk/news/scien...