A planet of mass m revolves around the Sun of mass M. If f1 and f2 are focal points of the elliptical orbit of the planet, the distance that changes throughout the planet's revolution is:
1
\(\overline{f_1 f_2}\)
2
\(\overline{f_1M}\)
3
\(\overline{Mf_2}\)
4
\(\overline{Mm}\)
5
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