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methane

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methane

Electromagnetic field

Coming from a non scientific background I have trouble understanding the concept of fields in general. I know it represents the strength of a force at points in space, but if space is empty then what...
14:38 Thu 28th Jun 20072 answers, last by fo3nix 19:14 Thu 28th Jun 2007
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methane

Elliptical orbits

I'd like to know why planetary orbits are elliptical and how Newton's work demonstrated this? Does the eccentricity of the ellipse depend on the orbiting bodies initial velocity before being captured...
18:15 Sun 11th Mar 20073 answers, last by heathfield 11:23 Mon 12th Mar 2007

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