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DocRob

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steveb

gravity

what is the speed of gravity? if an object the size of the sun were suddenly to appear how long would it take for an object say 10 light years away to feel the gravitational pull from it? is it the...
12:21 Sun 02nd Oct 20058 answers, last by mibn2cweus 19:38 Sat 08th Oct 2005
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ll_billym

Colour of light

How does light hold colour information, i.e. how is there red light, green light, etc.  I understand that coloured light is just an absence of all other colours from white light but how is this...
10:05 Mon 03rd Oct 20054 answers, last by DocRob 15:55 Sat 08th Oct 2005

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