Astronomy and physics education research and comments, field-tested think-pair-share (peer instruction) clicker questions, flashcard questions, in-class activities (lecture-tutorials), current events questions, backwards faded scaffolding laboratories, Hake gains, field-tested multiple-choice and essay exam questions, indices of discrimination, presentation slides, photos, ephemerae, astronomy in the marketplace, unrelated random sketches and minutiae.
20060720
Type II supernova simulators
Double Ball Bounce, North Carolina State University Physics Demo Room
Astronomy 10 learning goal M3.4
Basketball represents the imploding core, and the golf ball represents the diffuse outer layers.   The core implodes during neutronization, and then slightly rebounds outwards, colliding with the outer layers as they begin to fall inwards, resulting in the outer layers rebounding outwards at a much faster speed.   Watch frame-by-frame as the basketball falls down, bounces upwards as it hits the golf ball as it is still falling downwards, resulting in the golf ball flying upwards.
AstroBlaster(TM), Fascinations.com
A toy version of the two-ball supernova simulator...packaged with its own safety goggles, as explained here.
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