Astronomy Interactives
http://highered.mcgraw-hill.com/sites/0 ... ives.html#
I'm highlighting the dumb interactives they have here below. I'm not listing the dozen or more others that aren't so dumb. You can find those at the link above. The first one proves that dark matter is what causes stars in various parts of a galaxy to revolve at nearly the same speeds regardless of distance to the center, because when you take out the dark matter the velocities return to those seen closer to home where there's not much dark matter. And the 3rd one proves that neutron stars pulse because they rotate like an old-time lighthouse. The 2nd one proves that quasars seen on 2 or more sides of a galaxy are really one quasar whose image is duplicated by the galaxy's gravity bending the light. See?
Dark Matter Interactive (150.0K)
http://highered.mcgraw-hill.com/olcweb/ ... nteractive
Gravitational Lensing Interactive (115.0K)
http://highered.mcgraw-hill.com/olcweb/ ... nteractive
Neutron Stars Interactive (125.0K)
http://highered.mcgraw-hill.com/olcweb/ ... nteractive
Astronomy Interactives
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