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Ask the expert
A Brief History Of Measurements
Who defines a meter's length and a kilogram's weight, and how were these units established?
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Why is the Night Sky Dark?
If the universe is infinite and filled with shining stars, we might expect a continuously bright sky. Why then is it dark at night?
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Science Archive
The physics of light
Light is the common name for electromagnetic radiation with wavelengths of 400-750 nm.
July 17, 2012 זמן קריאה משוער 15 -
Ask the expert
Can a laser beam be used to stop an asteroid by producing an opposite momentum (velocity and mass)? Or
A laser beam is a ray of light with high intensity generated through the stimulated
February 23, 2012 זמן קריאה משוער 10
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