Your ship keeps whatever velocity it has. Each move is one burn: you can change your speed by one step left or right, up or down (or both, or neither), and the ship then flies on by its new velocity. Momentum builds fast, and so does the trouble: fly through every beacon, then reach the station at speed 1 or less to dock. A flight line that clips an asteroid is a crash, and asteroids side by side form a wall you can't slip between, so those burns are crossed out. Planets pull: end a move inside a planet's zone and its gravity bends your velocity one step towards it.
The par is the fewest moves that dock, worked out by a solver when the puzzle was made. Match it for three stars. A new course launches every day at midnight your time. Monday's field is small and open, and each day adds beacons, asteroids and gravity up to the 13×13 Sunday course with two planets.