MCQ
Two heavenly bodies ${S_1}$ and ${S_2}$, not far off from each other are seen to revolve in orbits
- ✓Around their common centre of mass
- BWhich are arbitrary
- CWith ${S_1}$ fixed and ${S_2}$ moving round ${S_1}$
- DWith ${S_2}$ fixed and ${S_1}$ moving round ${S_2}$

