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Specific Phenomena

Tatooine’s twin suns:
Tatooine's twin suns, Tatoo I and Tatoo II
Star Wars Episode IV: A New Hope contains a scene where Luke Skywalker stands and watches the double sunset of Tatooine’s twin suns.
Of the 242 Exoplanets currently known, about 20 or so actually orbit binary star systems. Specifically, they orbit what are known as "wide" binary star systems where the two stars are fairly far apart (a few AU). Tatooine presumably is of the other type - a "close" binary, whereby the stars are very close, and the planets orbit their common center of mass. Many planets are now presumed to orbit binary star systems, though gravitational effects from the dual star system tend to make them very difficult to find with current doppler and transit methods of planetary searches.

Asteroid field in Episode V
In Star Wars Episode V: The Empire Strikes Back, after the Battle of Hoth, the Millennium Falcon is pursued by imperial ships through a dense asteroid field. The chunks of rock in the field are moving at rapid speeds, constantly colliding, and densely packed. Ordinarily, an asteroid field or belt is unlikely to be so densely packed with large objects, because collisions reduce large objects to rubble that then eventually aggregates into planetoids by mutual attraction. Such a densely packed field could exist if it is either “young and transient” or “dominated by an external force”; there are a few clues that either might be happening in this scene of the movie. In contrast to Star Wars, the ship featured in 2001: A Space Odyssey, (Discovery One)'s course took it directly through the asteroid belt in novel, without real fear of collision on the part of the mission organizers.

Sound
Star Wars has various action sounds in space that the characters react to and are apparently aware of. But sound, as a pressure wave, must propagate through some form of matter. Since space is vacuous, it cannot actually carry sound waves. Two explanations have been posited. First, it is possible that the various ships’ deflector shields, when hit with radiation from explosions or blasters, cause the ships themselves to vibrate, producing sound. Second, the audio may be synthetically generated by ships’ sensor systems. Producing such sound would be beneficial because humans naturally react to their environment. It would also be an efficient use of a pilot’s limited senses during combat.[3] Similar systems have been proposed for real world vehicles to audibly alert a driver or pilot to something not in their field of vision, for example if there were a car in the driver's 'blind spot' the car could transmit an engine noise over the car's entertainment system from the appropriate direction. One line points to some or all of the sound portrayals being synthesized for the benefit of the pilots. In the radio dramatization of A New Hope, Han Solo tells Luke Skywalker: "Your sensors'll give you an audio simulation for a rough idea of where those fighters are when they're not on your screen. It'll sound like they're right there in the turret with you."