There might be a galaxy made mostly of dark matter orbiting the Milky Way!

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Sources:
http://arxiv.org/pdf/0908.0334.pdf
http://arxiv.org/pdf/1502.01358v1.pdf
http://arxiv.org/pdf/1601.03381v1.pdf
http://lcogt.net/spacebook/cepheidva...
http://www.skyandtelescope.com/astron...
http://earthsky.org/space/haveastron...
http://www.gemini.edu/node/12470
https://briankoberlein.com/2015/02/17...
   • Discovering the unseeable: The search...  
http://earthsky.org/space/anearbyda...

Images:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...