gravity

https://www.flickr.com/photos/gsfc/6945160410/in/photolist-p1XuhG-j4Hwby-kuQfuD-hyzMyT-ptrCNk-pN7nmE-oWv5Tp-q2fTri-nXu85b-nbxsKE-qC4785-bzHLe1-dPoPnW-pab3yz-qJsF3e-qxoLMF-VeshUS-mhaDLa-q8jtEo-g97Nph-fKNeRp-8ifuyk-o1huuJ-pbCLNo-phFbEk-dSspXi-bufVYN-pvXaxU-X67Wa2-9a2i63-iKmjBG-dKM4Fh-pAbfeJ-rf3CPj-i8pw7W-UiPQdn-sgSuj6-6v1qJk-o18U98-9iSCGT-pbehED-c8TCoQ-W1mSY1-npYXUQ-9KgqiH-j4Hnc1-dKFAiR-dNXCK4-W5gMSb-6Z669s

A New Theory of Dark Matter

Jim Hoover explains some of the theories behind the 96% of the universe that we can’t see.