Star date 1859.0617 we vented all of our steam escaping the gravitational pull of Earth. We have enough fuel to burn more, but we would be dipping into the air being used for life support in order to cause the combustion. We could try for a gravity assist from the moon, but have no more thrusters available to escape that gravity either.

I'm sorry captain there's just not enough steam, I'm an engineer not a bloody swedish sauna!

If you want to see this, watch "Bonanza".

A lot of people don't realize that "Star Trek (TOS)" is just "Bonanza in Space".

Seriously, watch an episode of TOS, then watch an episode of Bonanza. It's the same damn premise. Just swap space ships for horses and phasers for pistols and you have the exact same show.