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So I heard someone (Neil) describe 4 types of orbits, circular, elliptical, parabolic, and hyperbolic.

I'd argue in reality circular and parabolic are boundary cases that never exist in real life. So in reality all orbits are elliptical (though may be arbitrarily similar to circular) and hyperbolic (which also may be arbitrarily close to being parabolic).

#Astronomy #Physics