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 — and precisely because it's so
dauntingly massive.
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.
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.
This
not-to-scale gif from NASA illustrates the effect:
In essence, that's how Jupiter and the sun move through space together — though the distances and sizes are far different.
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