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Image: Solarsystembarycenter.gif: Carl Smith derivat…

Primary body

Primary body

Prime astronomical designated entity within a gravitational system.

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Readers' pathsAug 2026 – Oct 2026

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Share of the 236 clicks on its links

  1. Barycenter (astronomy)

    Center of mass of multiple bodies orbiting each other.

    39%

  2. Physical object

    Identifiable collection of matter.

    25%

  3. Double planet

    Binary system where two planetary-mass objects share an orbital axis external to both.

    9.7%

  4. Exomoon

    Moon beyond the Solar System.

    5.5%

  5. Solar System

    Planetary system consisting of the Sun and objects orbiting it.

    4.2%

Readers come from

Share of the 817 readers arriving from another article

  1. Moon

    Natural satellite orbiting Earth.

    31%

  2. Apsis

    Either of two extreme points in a celestial object's orbit.

    16%

  3. Retrograde and prograde motion

    Relative directions of orbit or rotation.

    11%

  4. Escape velocity

    Concept in celestial mechanics.

    6.6%

  5. Accretion disk

    Structure formed by diffuse material in orbital motion around a massive central body.

    6.4%

  6. Orbital period

    Time an astronomical object takes to complete one orbit around another object.

    5%

  7. Daytime

    Period of a day in which a location experiences natural illumination.

    4.9%

  8. Phobos (moon)

    Larger of the two moons of Mars.

    3.4%

  9. Orbit of the Moon

    The Moon's circuit around Earth.

    3.4%

  10. Orbital plane

    Concept in geometry and physics.

    1.5%