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	Topics Astronomy Atomic clocks Bridges Calculators Earth's magnetic field Electricity Engineering Engines Fluids Gravity Lightning Measurement and real-life Miscellany Nobel Prize winners Optics Particle physics Physics meets biology Physics meets Earth science Scientist biographies Semiconductors and computers Sound Spacecraft Theme park physics Thermodynamics Tides Units of measurement		Topic: Earth's magnetic field Auroras explained This comprehensive site explains auroras (also known as the northern lights) with accompanying pictures and videos. Earth's inconstant magnetic field Our planet's magnetic field is in a constant state of change, say researchers who are beginning to understand how it behaves and why. This site includes graphics of the Earth's magnetic field during a reversal.