Jupiter and the Sun Orbit an Invisible Point Beyond Our Star

In a fascinating revelation about celestial mechanics, NASA has clarified that neither the Sun nor Jupiter orbits the other in isolation; rather, both celestial bodies revolve around a shared center of mass. This center, known as the barycenter, is located just outside the Sun's surface due to Jupiter's immense mass.

Historical Context

The concept of planetary motion has evolved significantly since Galileo first turned his telescope to Jupiter in 1610. He observed four small moons that shifted positions each night, proving that they orbited Jupiter rather than the Earth. This groundbreaking discovery challenged the geocentric model that placed Earth at the center of the universe. Today, NASA applies the same fundamental principle: when two masses exert gravitational forces on each other, they do not remain stationary; they both orbit their common barycenter.

The Barycenter Outside the Sun

For smaller planets, the barycenter typically lies within the Sun. However, Jupiter's mass, which is more than twice that of all the other planets combined, shifts this point approximately 750,000 kilometers away from the center of our star, placing it just outside the Sun's surface. A study conducted by Vanderbilt University and NASA's Jet Propulsion Laboratory in 2020 pinpointed the solar system's barycenter with a remarkable accuracy of 100 meters, confirming its location just beyond the Sun.

Thus, it is not merely Jupiter that orbits the Sun; rather, both entities engage in a coordinated dance around their mutual center of mass.

The Spiral Motion

This phenomenon is consistent across all planets, including Earth, although the effect is minimal for our planet since its barycenter remains within the Sun. The entire solar system is in motion within the Milky Way, tracing a three-dimensional spiral path. No celestial body remains stationary at the center; instead, every object follows the center of mass of its respective system, which itself is also in motion.

Source:

• NASA “Barycenter” in Solar System Exploration