It was illegal to assume a closed orbit around Jupiter, or to land on any of the moons.

For an orbital spaceflight, a spacecraft enters a closed orbit around the planetary body.

Here the stable limit cycle is shown in state space as a closed orbit (the ellipse).

A closed orbit has the shape of an ellipse.

Orbiting bodies in closed orbits repeat their paths after a constant period of time.

In all instances, a closed orbit will still intersect the perturbation point.

Here the central black hole's gravity was so strong that light itself curved in closed orbits.

"Locked in a closed orbit about a magnetic core?"

A closed orbit, or cycle, is the image of a closed trajectory.

A simple 1/r potential results in a closed Keplerian elliptical orbit.