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Message: <blockquote data-quote="dommeme" data-source="post: 1682368" data-attributes="member: 242263">are these at the same height?ok, well, i'll go with a)they go at the same speedreason: look at it logically... all the satellites in geo-synchronous orbit travel at the same height - about 33,000 km above the equator - and they all travel at the same speed.. they have to, to stay in the same apparent place in the sky as the earth rotates.what are the chances that all of these satellites have exactly the same mass.... pretty near zero chance, i guess.therefore satellites which are already in practical use, travel at the same speed despite having different masses</blockquote>