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+With most science fiction films, the more science you
+understand, the {\em less} you admire the film or respect
+its makers. An evil interstellar spaceship careens across
+the screen. The hero's ship fires off a laser blast,
+demolishing the enemy ship---the audience cheers at the
+explosion. But why is the laser beam visible? There is
+nothing in space to scatter the light back to the viewer.
+And what slowed the beam a billionfold to render its advance
+toward the enemy ship perceptible? Why, after the moment of
+the explosion, does the debris remain centered in the screen
+instead of continuing forward as dictated by the laws of
+inertia? What could possibly drag and slow down the
+expanding debris (and cause the smoke to billow) in the
+vacuum of outer space? Note too the graceful, falling curve
+of the debris. Have the cinematographers forgotten that
+there is no gravity---no \quote {downward}--- in outer
+space? Of course the scene is accompanied by the obligatory
+deafening boom. But isn't outer space eternally silent? And
+even if there were some magical way to hear the explosion,
+doesn't light travel faster than sound? Shouldn't we {\em
+see} the explosion long before we {\em hear} it, just as we
+do with lightning and thunder? Finally, isn't all this moot?
+Shouldn't the enemy ship be invisible anyway, as there are
+no nearby stars to provide illumination?