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...rary to the rotation of the primary, that is, the object which forms the [[system]]'s [[Center|hub]]. ...] called into question the [[theories]] about the formation of [[planetary system]]s.

...al branches. Observational astronomy is focused on acquiring and analyzing data, mainly using basic principles of [[physics]]. Theoretical astronomy is ori ...stinct. (Albrecht Unsöld, The New Cosmos: An Introduction to Astronomy and Astrophysics, ISBN 3-540-67877-8

...hose sub-fields that rely on experimental, [[quantification|quantifiable]] data or the [[scientific method]] and focus on accuracy and objectivity. These u Early experiments in chemistry had their roots in the system of [[Alchemy]], a set of beliefs combining mysticism with physical experime

...ngs: generally, the astronomical observations simply did not square with a system controlled only by gravitational forces. Such observations have resulted in ...ant objects would rotate at a slower pace. Since this is true of our solar system, it should be no different for any galaxy. [[See Illustration 7]] (Newton's