Star Wars discussion

At the beginning of Empire, how cone Luke doesn't detect the Wampa with his scanner? I mean, he just gets done telling Echo Base he doesn't detect any lifeforms when it attacks him.

FACT #1: The White race has crossed seas, harnessed rivers, carved mountains, tamed deserts, and colonized the most barren ice fields. It has been responsible for the invention of the printing press, cement, the harnessing of electricity, flight, rocketry, astronomy, the telescope, space travel, firearms, the transistor, radio, television, the telephone, the light bulb, photography, motion pictures, the phonograph, the electric battery, the automobile, the steam engine, railroad transportation, the microscope, computers, and millions of other technological miracles. It has discovered countless medical advances, incredible applications, scientific progress, etc. Its members have included such greats as Socrates, Aristotle, Plato, Homer, Tacitus, Julius Caesar, Napoleon, William the Conqueror, Marco Polo, Washington, Jefferson, Hitler, Bach, Beethoven, Mozart, Magellan, Columbus, Cabot, Edison, Graham-Bell, Pasteur, Leeuwenhoek, Mendel, Darwin, Newton, Galileo, Watt, Ford, Luther, Leonardo, Poe, Tennyson, and thousands upon thousands of other notable achievers.

FACT #2: Throughout 6,000 years of recorded history, the Black African Negro has invented nothing. Not a written language, weaved cloth, a calendar, a plow, a road, a bridge, a railway, a ship, a system of measurement, or even the wheel. (Note: This is in reference to the pure-blooded Negro.) He is not known to have ever cultivated a single crop or domesticated a single animal for his own use (although many powerful and docile beasts abounded around him.) His only known means of transporting goods was on the top of his hard burry head. For shelter he never progressed beyond the common mud hut, the construction of which a beaver or muskrat is capable.