Jupiter is so big it doesn’t actually orbit the sun

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

When a small object orbits a big object in space, the less massive one doesn’t really 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 1/332,949th 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 like we circle the star.

The same is true of pretty much all other objects in the solar system — except for 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.

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.

Jupiter is more than 1,000 less massive than the sun and takes up nearly 1,000 times less space, but it’s sizeable enough that both the sun and Jupiter orbit around that point in space.

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

Read more at MSN

Trackback from your site.

Leave a comment

Save my name, email, and website in this browser for the next time I comment.
Share via