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Observing sun spots
Use the telescope that you made in a last experiment. Set it up so that it points directly at the sun and focus it so that a clear and bright image of the sun is formed on a piece of white cardboard placed a short distance from the eyepiece lens. If sun spots are there on the surface of the sun you may be able to observe them as small dark spaces of irregular outline on the image. Caution. Do not look at the sun by the telescope, unless your eyes are protected by a dark glass filter.
Ecosystem: As far as we know, our earth is the only planet where life exists, though scientists su constantly searching for signs of life on other heavenly bodies. You have al
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OBELIA IS CONSIDERED TO BE OF SPECIAL INTEREST IN ZOOLOGY AND AS AN ANIMAL SHOWING AN INTERMEDIATE GRADE OF ORGANISATION
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Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w
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