It’s time to ditch dark matter in favor of a new theory of gravity.

The barred spiral galaxy UGC 12158. (Image credit: Wikimedia , CC BY-SA) This article was originally published at The Conversation. (opens in new tab) The contributed the article to Space.com’s Expert Voices: Op-Ed & Insights. Indranil Banik (opens in new tab)Postdoctoral Research Fellow of Astrophysics, University of St Andrews We can model the motions of … Read more