Is the ship supposed to be in orbit?
The captain says "let's bring us into close orbit" when they approach the planet. But then when Danny Mcbride brings them into the ill advised 80km and 40km above the atmosphere zones, they appear to be floating above/among the clouds somehow.
This seems to follow the Event Horizon school of 'orbital' mechanics where being in orbit just means you're at a certain altitude and can ignore the actual physics of being in an orbit.
So, is the ship supposed to be in orbit or does it have the absolutely colossal amount of constant thrust that would be required to keep itself aloft stationary above the planet?