LOM v1.0atomicLOM v1.02URLhttp://portal.discoverthecosmos.eu/node/187702enThis scenario is based on the deviation of the light by massive objects. The light is emitted by a background source (star or galaxy) and received on Earth. In the absence of deviation, only one ray is received on Earth, along the direction to the source. If a mass (the lens) is located between Earth and the source, general relativity states that light rays are deviated towards Earth. The students will discuss the geometrical aspect of this phenomenon, the different orders of magnitude of the lensing, and then apply this to a case of ‘microlensing’ to infer the mass of a lens in our Galaxy.demonstrator lensing Galaxy general relativity massLOM v1.0draft1.0LOM v1.0author2012-09-28LOM v1.0publisher2012-09-28enLOM v1.0LOM v1.0creator2012-09-28LOM v1.0validatorLOM v1.0browserLOM v1.0anyLOM v1.0osLOM v1.0anytext/htmlhttp://portal.discoverthecosmos.eu/node/187702LOM v1.0noLOM v1.0noLOM v1.0activeLOM v1.0highLOM v1.0difficultLOM v1.0exerciseLOM v1.0graphLOM v1.0tableLOM v1.0Inquiry-Based TeachingLOM v1.02 didactic hours15-18LOM v1.0DisciplineScienceAstronomy: CosmologyAstronomy: GalaxiesAstronomy: Gravitational lensesAstronomy: Microlensing effectAstronomy: Milky WayAstronomy: Theory of relativity