How does speed work relative to the galaxy?

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Offline thedoc

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How does speed work relative to the galaxy?
« on: 27/07/2016 13:53:01 »
John asked the Naked Scientists:
   I would like to pose a question that may be lengthy. How should I proceed? Is this the place for it? If so, then ...
    Let's say I am standing on earth at the leading edge, facing the direction of "N". The earth is rotating in the direction of N. The earth is orbiting in the direction of N. The solar system is rotating in the galaxy in the direction of N. The galaxy is moving in the direction of N. How fast am I moving? If I take a step, at that moment, am I not going slower than a person walking in the opposite direction with respect to time? Assuming that time moves slower as you move faster. This would also mean that time fluctuates constantly however you still need a point of reference don't you? Without it speed means nothing. What would that point of reference be?
    Also, if you launch a rocket or ship in that direction aren't you all ready going very fast before you add your relative speed? Once you leave the earth what are you basing your speed on? Is this one of the reasons for the theory of dark mater?
Just some questions.
Thank you for your time.
What do you think?
« Last Edit: 27/07/2016 13:53:01 by _system »