By David Bergamini
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Additional resources for The Universe
Lionth-of-an-inch wave length. — — — " A refractor telescope gathers light through an "objective" lens at the top of tube, bends the rays to the eyepiece, and its long then carries them where they are focused by a series of magnifying lenses. Unlike the reflector telescopes, light passes through a refractor's tube a single time. Refractors were first used extensively by Galileo. 36 — tril- — solar system, the rapidity of a star's rotation, the temperature of strength of its magnetic Held, even the amount of and the earth.
Static. so ra- noise. \t a series of inter- national conferences, radio astronomers have persuaded nations to regulate the air waves and keep commercial transmissions off the chief astronomical frequencies of nature. Even of the celestial spheres out unwanted is so. the radio sky remains nois)' often signals, radio drowned out by man-made and the gurgle din. To weed astronomers feed the impulses from their an- tennae into powerful amplifiers which usually feed, in turn, into computers for sorting out the The fidelity of all random space this noises from the electronic nonrandom human gear has to be enormously high a com- A puter which sorts out depth.
The latter is permanently recorded SPECTRUM OF on a photographic LINE" PATTERN IN SUNS SPECTRUM SIRIUS This requires that the observer ride in itself. An alternate arrangement, called Cassegrain, uses a small convex mirror to reflect the light beam back through a hole in the main mirror to an observer and photographic plate at the base of the instrument. Thus astronomy's basic tools the telescope, photographic combine to form a single instrument to plate and spectrograph decipher the story of starlight.