Home » Jupiter is so big it does not actually orbit the sun

Jupiter is so big it does not actually orbit the sun

by Alien UFO Sightings
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One of my daughter’s favorite books is “Space Walk” by Salina Yoon. Each page shows a planet accompanied by a rhyming factoid about it.

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But each time I read it to her — sometimes three or more times a day — I furrow my nerdy brow at this line: “Of all the planets that circle the sun, giant Jupiter is the biggest one.”

The gas giant is indeed the largest planet in the solar system, weighing more than twice the mass of all the other planets,moons, asteroids, comets, and more combined.

However, Jupiter does not technically orbit the sun — because it’s so dauntingly massive.

When a small object orbits a big object in space, the less massive one doesn’t travel in a perfect circle around the larger one. Rather, both objects orbit a combined center of gravity.

For a puny, fragile planet like Earth, which is 0.000003 the mass of the sun, the center of gravity resides so close to the center of the sun that we don’t even notice the slightly off-kilter orbit. It seems as though we circle the star.

The same is true of most other objects in the solar system — except Jupiter.

The gas giant is so big that it pulls the center of mass between it and the sun, also known as the barycenter, some 1.07 solar radii from the star’s center — which is about 30,000 miles above the sun’s surface.

jupiter sun barycenter center of mass distance nasa business insider labeledA to-scale illustration of where the sun-Jupiter barycenter is. NASA/SDO; Business Insider

Jupiter is about 0.001 as massive than the sun, but it’s sizeable enough that both the sun and Jupiter orbit that point in space.

This not-to-scale GIF from NASA illustrates the effect:

Essentially, that’s how Jupiter and the sun move through space together — though the distances and sizes are far different.

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So the next time you read a kid’s book that says that Jupiter circles the sun, you’d be forgiven for trying to rip out that page. Just like my daughter enjoys doing.

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