But up above the planet, struggling to maintain orbit.

Mr. Scott just gave me additional energy from the impulse engines for maintaining orbit.

Each has a song, used to maintain orbit and angle.

"How long can we maintain orbit when that happens?"

The ship and others like it had maintained orbit around Saturn for almost a century.

"I couldn't maintain orbit; the planet's breaking up and the gravity field was shifting too radically!"

Maintain standard orbit until further notice, and begin long-range scans of surrounding space.

Unable to maintain orbit, with all landers destroyed, the crew had to bring the ship itself down.

We are no longer moving rapidly enough to maintain orbit.

Staying far enough up to maintain orbit, they were close enough to be below the planet's radiation belt.