Time may have existed previously to this universe

[st.bot.32]

light does slow when it passes through a medium denser than a vacuum, which is why reading glasses prisms and pretty rainbows work. how much it refracts depends on the density of the medium and the frequency of the light. this is why white light, which is a mixture of light with different frequencies is split by a prisim. each frequency is refracted (or slowed) by a different amount.
its not because the light has hit the atoms and been absorbed- the light would not pass through- rather its an attractive force akin to gravity where the mass of the material and the mass of the photon are mutualy atractive.

thanks for the clarification mate. new things to learn!

 

[druglessdouglas]

st.bot- what you said, is true of reflected light.

 

[Meduzz]

physics phun

 

[druglessdouglas]

i nearly quarked my pants. and thats a lot (a quark- a quart. james joyce)

 

[buffachino]

So....... lame........

 

[ararat]

as much as I think that science is not everything, but saying it is just toys for adults is a bit too much. if it wasn't for science, we wouldn't be sitting in front of our computers and wouldn't be communicating and exchanging ideas.

 

[buffachino]

Yeah, we would be sitting face to face exchanging ideas.

 

[druglessdouglas]

wee wouldnt. were half a planet away. and im scared of deadly animals so youd have to come here, on foot aranoid:

 

[buffachino]

I would rather do that than say unequivocally that science has only benefited our means of communication. I think it has rather made it a lot harder to communicate, and alienated mankind from nature and itself (both being one and the same).

 

[druglessdouglas]

no doubt it is science, or at least technology that is destroying our biosphere.
i am afterall an earth scientist and an ecologist. its just that we cant reverse time. weve done a lot of damage you and i. now our only salvation lies in using technology in a way thats a lot less damaging. we knoe what we have to do but dont want to face the facts. stop driving, flying etc. turn our beloved computers off when we arent using them. little things. billions of little things every day.

its that of be forced into another stone age

 

[Meduzz]

A little bit scifi but makes sence. It has been posted here before I think....