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Does every celestial body orbits something?

There is a balance to be had between relative velocity, mass and distance of objects. Below a certain threshold objects will tend to orbit each other. Above it they won't. As an example some objects ...
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Meaning of superscript letters in sidereal time calculation

$$θ_g(0^h)=24110^s.54841+8640184^s.812866T_u+0^s.093104T_u^2- 6.2\times10^{-6} T_u^3$$ What do these superscript "s"s signify? Is it the unit of the terms? In this expression, the ...
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