system
Given the following post, respond as if you're commenting on Reddit:
human
Why does the ISS point the same direction relative to the Earth at all times in its orbit? Wouldn't it be more energy efficient to NOT adjust its rotation/tilt/pitch/axis with reaction wheels?
gpt
It doesn't consume any energy to rotate at a constant speed i.e. it only need to start rotating once, it doesn't need to keep the rotation up. For all things in space they will keep moving in the same way until some force is applied. If the space station rotates by one revolution per orbit it will have the same side against earth at all time.


 If we look at our moon it have the same side against the earth at all time without any reaction wheels changing its angular velocity.


Unfortunately some force will still need to be applied after the a while because the space close to earth (or anywhere in space for that matter) is not a perfect vacuum, but creating the angular momentum is quite marginal compared to the force needed to keep it in orbit.

Edit. 
As corrected the orbital time is very much less than a earth-day so it has to be about one revolution per 90 minutes instead i. e. one revolution per orbit.