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How fast is the Earth moving?
In order to answer this question, we must first make sure we are aware of what is know as the frame of reference. A surfer hardly moves at all, relative to the wave he is on, but seen from the shore he is rushing towards the observer. Cosmic background radiation provides an absolute reference system for speed in space (see the astronomic question from week 10: Where is the coldest point in the Universe?). It is measured coming almost completely uniformly from every direction of space with a temperature of approximately minus 270 degrees Celsius.
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Last update: 12/03/2009 12:28:32