• Eheran@lemmy.world
    link
    fedilink
    English
    arrow-up
    11
    ·
    1 day ago

    Binary systems form when two celestial bodies orbit around a common center of mass

    Everything does that. In the case of earth and sun this center of mass (barycenter) happens to be inside the sun. Earth and moon also has it inside earth. This barycenter being outside of both objects is the actual important thing.