I saw those figures just recently in an astro mag, If I can find it I will post. (imagine a short period of pondering...) ......
Actually just googled and this link gives some of the answers
http://en.wikipedia.org/wiki/Milky_Way of course the speed would be proportional to our distance from the centre of the galaxy. Here's the google search so you don't even need to type...
http://www.google.com.au/search?hl=e...le+Search&meta=
Quote:
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It would take the solar system about 200-250 million years to complete one orbit ("galactic year"), and so is thought to have completed about 20-25 orbits during its lifetime. The orbital speed is 217 km/s, i.e. 1 light-year in ca. 1400 years, and 1 AU in 8 days.
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