The Dark Mystery of Galaxy X

There might be a galaxy made mostly of dark matter orbiting the Milky Way!
----------
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
----------
Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Andreas Heydeck, Justin Lentz, Will and Sonja Marple, Benny, Chris Peters, Tim Curwick, Philippe von Bergen, Patrick, Fatima Iqbal, Lucy McGlasson, Mark Terrio-Cameron, Accalia Elementia, Kathy & Tim Philip, charles george, Kevin Bealer, Thomas J., and Patrick D. Ashmore.
----------
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
----------
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
----------
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/cepheid-variable-stars-supernovae-and-distance-measurement/
http://www.skyandtelescope.com/astronomy-news/cepheid-stars-map-the-milky-way-and-beyond-022020154/
http://earthsky.org/space/have-astronomers-pinpointed-dark-matter-galaxy-x
http://www.gemini.edu/node/12470
https://briankoberlein.com/2015/02/17/galaxy-x/
https://www.youtube.com/watch?v=I9tel-ZCswM
http://earthsky.org/space/a-nearby-dark-matter-galaxy-triangulum-ii

Images:
https://commons.wikimedia.org/wiki/File:PGC_60095_Draco_Dwarf_Hubble_WikiSky.jpg
https://commons.wikimedia.org/wiki/File:Heic1323a_-1243686232.jpg

Видео The Dark Mystery of Galaxy X канала SciShow Space