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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: 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 ?

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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Extreme Deflections

For black holes the lightrays may even propagate around the lens.

It even becomes possible that light circulates around the mass. This results in a lensed image where the original image appears inside the lens - even in multiple form.

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