"Island in the Sky" is a Disney comics story written and drawn by Carl Barks.
They land on a small asteroid occupied by aliens and (normal) birds.
Donald accidentally chases the birds away to a nearby planet, and with them, the only source of food for the aliens is gone.
Huey, Dewey and Louie make Scrooge find a solution for the problem they caused.
This detour results in a fuel stop at the space gas station, which gives Scrooge a high bill.