Originally Posted by Larry Jacks

If you have enough thrust, you can orbit wherever you want or even hover. That might explain the otherwise absurdity of the Enterprise falling out of space whenever the engine failed. We can't do this today because chemical engines (the only ones that produce enough thrust) can't burn for very long before all of the propellant is consumed. However, in the Star Trek world, apparently unlimited power is available for both propulsion and mundane things like preparing a meal using a replicator.