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This video shows the spiral shape of our galaxy and two of its small satellite galaxies, the Large and Small Magellanic Clouds (to the left). The satellites orbit the main galaxy and, in the process, trigger slow-motion waves in it. On a human time scale, those waves look like a static warp in the galactic outskirts

Scores of readers responded to my Galactic Challenge (proposed in Part I of this series), with lots of cool ideas. [More]

The map of the solar system may be due for a little updating.