SassyPilotsWife - wrote:
If you really have that much time on your hands, please tell us, Why is the sky blue ? Why are trees brown? Why is the earth round ?
Well I find myself with time upon my hands, so let me endeavour to respond to Sassy's questions:
Q) Why is the sky blue ?
A) Well the sky is not always 'blue', and it's also not necessarily seen in the same colour by all living creatures (
as what is 'seen' depends upon how ones eyes are attuned to react to the 'light' contained within the electromagnetic spectrum) but as to an explanation as to why the sky changes colour (
as 'seen' by human eyes), that's due to the wavelength dependence of '
Rayleigh Scattering'.
Q) Why are trees brown?
A) Err, not all trees are brown?!
Q) Why is the earth round ?
A) That'd be due to Gravity! (
albeit that most spinning orbs, ones that have mass, are not perfectly round, due to the Centripetal force of rotation acting upon the mass in the direction of rotation. Accordingly the Earth is in fact an 'Oblate Spheroid' wherein, when measured around the equator, the Earth is 43 km more than the diameter when measured via the poles).