Dierck-Ekkehard Liebscher

Relativity, geometry, and cosmology in pictures

    Gesamtschau    Distances    Reflections    Projective geometry    Conics    Minkowski    Lobachevski    Curvature    Michelson    Space-time    Special relativity    Try it yourself relativity    Mass and energy    Gravitation    Cosmology    Cosmic nucleosynthesis    Cosmic structure    Cosmic vacuum    Cosmic pinpoints    Time and entropy    Quantum physics    Physics supplement    Paper polyhedra

Relativity: try it yourself

Lichteck (quadrilateral of light)


Time dilation

Twin paradox (Zwillingsparadoxon)