photo credit: Jan Curtis
Physics in Action: Space Weather
This photo (hi-res version) shows the Aurora--the Northern Lights--over Alaska. The green color comes from the spectral lines of oxygen. For an image of the Southern Lights, taken from space, see NASA's Earth Observatory.
Auroras are produced by magnetic storms in space. To learn about space weather, you can visit Physics in Action: Space Weather, from the American Physical Society's Physics Central, and NASA's Space Weather Center.
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My Cup Runneth Down
Try My Cup Runneth Down, from Physics Central, by the American Physical Society, to see what happens at the surface between two fluids when the higher-density fluid is on top. You can do this experiment right in your own kitchen. To learn more, about this phenomenon, see the archived Physics in Your World feature from June 28, 2006.
This feature was updated January 3, 2010.