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Do You Know
Questions & Answers on General Knowledge.

Question:
What causes the colors in the aurora borealis?
Answer:
These colors come from the atomic fluorescence of particles high above the earth's surface. As charged particles from the sun's "solar wind" spiral through the earth's magnetic field toward its poles, they collide with one another and with atoms in the earth's upper atmosphere. The energy of such collisions can excite the atoms involved and cause them to emit light.
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  • Most Expensive Motorcycles

    1928 Indian Altoona

    US$247,500 The Altoona Speedway was a 1.25 mile (2 km) board track located in central Pennsylvania which was the home of the American Board Track Championship races during the 1920s. Winning Altoona was so important that a winning machine might adopt the track name as its own, as was the case with many other bikes and cars which won at other famous venues such Daytona, Bonneville, TT and IOM, Le Mans ad infinitum. On July 9, 1926, Curley Fredericks lapped Altoona at an average speed of 114 mph (183 km/h) in a race, the highest speed ever recorded on a circular track, and the Indian racer was immediately dubbed the Altoona.


    Chourishi Systems