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... I find square is difficult
QuoteSaturn, the sixth planet in our solar system, has caused quite a stir ... when the NASA Cassini Orbiter photographed a six sided geometric shape on the surface of the planet.http://scienceray.com/astronomy/something-strange-about-saturn/
Saturn, the sixth planet in our solar system, has caused quite a stir ... when the NASA Cassini Orbiter photographed a six sided geometric shape on the surface of the planet.
Quote from: latebind on 06/12/2009 22:13:28... I find square is difficultTable salt is close* to square ...http://www.sciencephoto.com* Perfect geometric shapes are idealized mathematical concepts and don't occur in nature.
I however have to disagree with your statement ..."* Perfect geometric shapes are idealized mathematical concepts and don't occur in nature."I believe that they can and do exist, take for example a simple soap bubble, which can easily be a perfect sphere.
Also a rainbow is a perfect circle.
Light travels in a straight line.
Waves of all sorts are mathematically definable shapes.
Behold the carbon nanotubeEDIT: oops, I forgot that these tubes don't occur naturally 
The not-so-new form of carbonBut it turns out that we've actually been making fullerenes unknowingly for thousands of years – whenever we burn a candle or an oil lamp. The candle's flickering flame vaporises wax molecules containing carbon, hydrogen and oxygen. Some of these molecules burn instantly in the blue heart of the flame. Others move upwards into the yellow tip where the temperature is great enough to split them apart. The result is carbon-rich soot particles that glow, giving off gentle yellow light. Amid this soot are buckyballs.Buckyballs also exist in interstellar dust and in geological formations on Earth. So while they are new to science they are reasonably common in nature.