Cosmology fills in gaps of knowledge with an undiscovered substance – dark matter. http://ow.ly/Vfn02 pic.twitter.com/6i0dtOgUF6
6:01 AM - 30 Nov 2015
0 replies
4 retweets
10 likes
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.