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Galaxies

  • E2-61: GALAXY MODEL

    E2-61
    Illustrate our galaxy.

    This is a model of our galaxy, the size of the milky way shrunk to about 50cm diameter, a ratio of 1:2x10+21!! See table of interesting sizes in the Demonstration Reference File, a copy of which is available with the demonstration.

    The red marble locates the approximate position of the solar system.

    FRAGILE! Be careful.

    E2, OS12

  • E2-62: SPIRAL GALAXY - WATER MODEL

    E2-62
    Show that "permanent" spiral structure can exist as a wave which moves independently from the fluid
    Rapidly rotate the stirrer to produce a vortex, making the direction of rotation clear to the class. Spiral waves will then be seen initially rotating very slowly with the fluid, then stopping, and finally rotating in the opposite direction. Finally, by injecting food coloring in a line across the vortex it can clearly be seen that differential rotation would destroy the spiral structure if it were "fixed" to the fluid.
    OS7