 Space opera can be contrasted with "hard science fiction", in which the emphasis is on the effects of technological progress and inventions, and where the settings are carefully worked out to obey the laws of physics, cosmology, mathematics, and biology.Examples are seen in the works of Alastair Reynolds or the movie "The Last Starfighter".At other times, space opera can concur with hard science fiction and differ from soft science fiction by instead focusing on scientific accuracy such as "The Risen Empire" by Scott Westerfeld.