atomic2URLhttp://portal.discoverthecosmos.eu/node/187703How to weigh a galaxyenThe teaching activities consist in measuring the mass of a spiral galaxy, viewed edge-on, using the same procedure employed by astronomers. It is surprising how just a few measurements and the knowledge of a few fundamental laws of physics make it possible to weigh the largest and most distant objects in the Universe, despite the impossibility of carrying out direct measurements. The simple measurement proposed here makes it possible to obtain experimental evidence for the existence of the famous dark matterdemonstrator Galaxy mass doppler effect rotation curvedraft1.0author2012-09-28publisher2012-09-28enLOM v1.0creator2012-09-28validatorbrowseranyosanytext/htmlhttp://portal.discoverthecosmos.eu/node/187703nonoactivehighdifficultexercisegraphtableInquiry-Based Teaching2 didactic hours15-1818-25DisciplineAstronomy: CosmologyAstronomy: Dark matterAstronomy: GalaxiesAstronomy: OrbitAstronomy: Rotation curveAstronomy: Stars