Astrophysik: Gravitationslinsen
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Module: Astrophysik: Gravitationslinsen
Sequence: Start
Slide:
Slide: A Galaxy Produces a Multi-image of a Quasar
Branching Point: The visible sky is nothing but an optical fraud
Sequence: (1) Prinzip
Slide: Why does a mass act like a lens ?
Slide: Why does a mass act like a lens ?
Slide: Why does a mass act like a lens ?
Slide: Mass distributions acting as lenses
Slide: Glas lens visualizing the effect of a gravitational lens
Slide: Extreme Deflections
Slide: Strange Optics
Slide: Cosmic Distortions
Slide: The image of the sky is permanently changing
Slide: Encounter of third degree
Sequence: (2) History
Slide: Early speculations
Slide: Einsteins triumph
Slide: Einstein remains sceptical
Slide: ... an odd publication
Slide: Galaxies as gravitational lenses
Sequence: (3) Astrophysics
Branching Point: Gravitational Lenses as Tools in Astrophysics
Sequence: (3.1) galaxies
Slide: How Massive is a Galaxy ?
Slide: How Massive is a Galaxy Cluster ?
Slide: How Massive is a Galaxy Cluster ?
Sequence: (3.3) Hubble
Slide: How Does the Universe Expand ?
Sequence: (3.4) planets
Slide: Double Quasar Q0957+561
Slide: Planets in Foreign Solar Systems
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Why does a mass act like a lens ?
A mass curves the surrounding space time.
Light propagates on shortest paths in this geometry and thus appears deflected.
The observer perceives two images, situated on the left and right hand side of the source.
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