Term
| ELECTROMAGNETIC RADIATION |
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Definition
| LIGHT IS MADE UP OF BOTH ELECTRIC AND MAGNETIC FIELDS. |
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Term
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Definition
| THE DISTANCE BETWEEN PEAKS |
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Definition
| TOO AWKWARD TO MEASURE SUCH SHORT DISTANCES IN MILLIMETERS, SO PHYSICISTS AND ASTRONOMERS DESCRIE THE WAVELENGTH OF LIGHT USING EITHER THE UNIT OF __ |
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Definition
| TOO ASKWARD TO MEASURE SUCH SHORT DISTANCES IN MILLIMETERS, SO PHYSICITS AND ASTRONOMERS DESCRIBE THE WAVELENGTH OF LIGHT USING EITHER THE UNIT OF BILLIONTH OF AMETER (10-9 M)___WHICH IS NAME AFTER THE SWEDISH ASTROMERS ANDERS ANGSTROM |
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Definition
| RADIATION, WITH WAVELENGTHS RANGING FROM 700 nm TO ABOUT 1 mm |
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Definition
| ELECTROMAGNETIC WAES WITH WAVELENGTHS SHORTER THAN VIOLET LIGHT ARE CALLED |
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| SHORTER-WAVELENGTH ELECTROMAGNETIC WAVES THAN UV ARE CALLED |
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Definition
| ARE THE SHORTEST WAVELENGTH ELECTROMAGNETIC WAVES THAN UV ARE CALLED |
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Term
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Definition
| A MINIMUM SIZED BUNDLED OF ELECTROMAGNETI WAVES. A PARTICLE OF LIGHT IS CALLED |
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Term
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Definition
| ONLY VISIBLE LIGHT, SOME SHORT-WAVELENGTH INFRARED RADIATION, AND SOME RADIO WAVES REACH EARTH'S SURFACE THROUGH WHAT ARE CALLED |
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Term
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Definition
| A TELESCOPE TO FOCUS LIGHT BY USING A LENS TO GATHER AND FOCUS THE LIGHT |
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Term
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Definition
| TELESCOPE USE TO FOCUS LIGHT USING A MIRROR |
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Term
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Definition
| THE MAIN LENS INA REFRACTING TELESCOPE |
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Term
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Definition
| THE MAIN MIRROR IN A REFLECTING TELESCOPE |
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Term
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Definition
| BOTH KINDS OF TELESCOPES FORM A SMALL, INVERTED IMAGE THAT IS DIFFICULT TO OBERSERVE DIRECTLY, SO A LENS CALLED THE ____ IS USED TO MAGNIFY THE IMAGE AND MAKE IT CONVENIENT TO VIEW. |
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Definition
| IS THE DISTANCE FROM A LENS OR MIRROR TO THE IMAGE IT FORMS OF A DISTANT LIGHT SOURCE SUCH AS A STAR. |
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Term
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Definition
| TELESCOPES HAVE SERIOUS DISADVANTAGES. MOST SUFFER FROM AN OPTICAL DISTORTION THAT LIMISTS THEIR USEFULNESS. WHEN LIGHT IS REFRACTED THROUGH GLASS, SHORTER WAVELENGTHS BEND MORE THAN LONGER WAVELENGTHS. AS A RESULT YOU SEE A COLOR BLUR AROUND EVERY IMAGE. THIS COLOR SEPARATION IS CALLE ___ |
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Term
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Definition
| TELESCOPE TO GATHER VISIBLE LIGHT |
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Term
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Definition
| TELECOPE TO GATHER RADIO RADIATION. |
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Term
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Definition
| REFERS TO THE ABILITY OF A TELESCOPE TO COLLECT LIGHT. |
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Term
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Definition
| REFERS TO THE ABILITY OF THE TELESCOPE TO REVEAL FINE DETAIL |
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Term
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Definition
| ONE CONSEQUENCE OF THE WAVELIKE NATURE OF LIGHT IS THAT THERE IS AN INEVITABLE SMALL BLURRING CALLED A ___AORUND EVERY POINT OF LIGHT IN THE IMAGE, AND YOU CAN'T SEE ANY DETAIL SMALLER |
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Term
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Definition
| ONE WAY TO IMPROVE RESOLVING POWER IS TO CONNECT TWO OR MORE TELESCOPES IN AN ___WHICH HAS A RESOLVING POWER EQUAL TO THAT OF A TELESCOPE AS LARGE AS THE MAXIUM SEPARATION BETWEEN THE INDIVIDUAL TELESCOPES |
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Term
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Definition
| IN ADDITION, WHEN YOU LOOK THROUGH A TELESCOPE, YOU LOOK THROUGH MILES OF TURBULENCE IN EARTH'S ATMOSPHERE, WHICH MAKES IMAGES DANCE AND BLUR, A CONDITION THA ASTRONOMERS CALL |
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Term
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Definition
| A SITUATION CAN BE IMPROVED BY A DIFFICULT AND EXPENSIVE TECHNIQUE CALLED ____IN WHICH RAPID COMPUTER CALCULATIONS ADJUST THE TELESCOPE OPTICS AND PARTLY COMPENSATE FOR SEEING DISTORTIONS. |
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Definition
| THE LEAST IMPORTANT POWER OF A TELESCOPE IS ____THE ABILITY TO MAKE AN IMAGE LARGE |
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Term
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Definition
| optical astronomers avoid cities because ____the brightening of the night sky by light scattered from artifical outdoor lighting,can make it impossible to see faint objects |
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Term
SIDEREAL TRACKING
(SIDEREAL, REFERS TO THE STARS) |
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Definition
| TELESCOPES LOCATED ON THE SURFACE OF EARTH, WHETHER OPTICAL OR RADIO, MUS MOVE CONTINUOUSTLY TO STAY POINTED AT A CELESTIAL OBJECT AS EARTH TURNS ON ITS AXIS. THIS IS CALLED |
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Term
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Definition
| WS THE FIRST IMAGE RECORDING DECISE USED WITH TELESCOPES. |
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Term
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Definition
| SENSITIVE LIGHT METERS TO MEASURE THE BRIGHTNESS OF INDIVIDUAL OBJECTS VERY PRECISELY. |
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Term
| CHARGE COUPLED DEVICES (CCDs) |
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Definition
| MOST MODERN ASTRONOMERS USE THIS AS BOTH IMAGE RECORDING DEVICES AND PHOTOMETERS |
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Term
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Definition
| CAN BE USED LIKE A SMALL PHOTOGRAPHIC PLATE, BUT THEY HAVE DRAMATIC ADVANTAGES OVER BOTH PHOTOMETERS AND PHOTOGRAPHIC PLATES. |
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Term
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Definition
| MEANING, CONVERTED TO NUMERICAL DATA, AND CAN BE READ DIRECTLY INTO A COMPUTER MEMORY FOR LATER ANALYSIS. |
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Term
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Definition
| ASTRONOMERS ALSO MANIPULATE IMAGES TO PRODUCE ____IN WHICH COLORS REPRESNT DIFFERENT LEVES OF INTENSITY AN ARE NOT RELATED TO THE TRUE COLORS OF THE OBJECT |
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Term
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Definition
| TO ANALYZE LIGHT IN DETAIL, YOU NEED TO SPREAD THE LIGHT OUT ACCORDING TO WAVELENGTH INTO A SPECTRUM, A TASK PERFORMED BY A ___ |
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Term
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Definition
| VIOLET (SHORT WAVELENGTH) LIGHT BENDS MOST, ANDRED (LONG WAVELENGTH) LIGHT LEAST. thURS, THE WHITE LIGHT ENTERING THE PRISM IS SPREAD INTO WHAT IS CALLED |
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Term
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Definition
| IS A PIECE OF GLASS WITH THOUSANDS OF MICROSCOPIC PARALLEL LINES SCRIBED ONTO ITS SURFACE |
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Term
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Definition
| CAN REFLECT THE LIGHT THROUGH A HOLE IN THE PRIMARY MIRROR TO A CASSEGRAIN FOCUS |
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Term
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Definition
| IN LARGER TELESCOPES THE LIGHT CAN BE FOCUSED TO A ____POSITION HIGH IN THE TELESCOPE TUBE. ALTHOUGH, IT IS A GOOD PLACE TO IMAGE FAINT OBJECTS, THE PRIME FOCUS IN INCONVENIENT FOR LARGE INSTRUMENTS. |
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Term
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Definition
| THIS FOCAL ARRANGEMENT MY BE THE MOST COMMON FORM OF ASTRONOMICAL TELESCOPE. IT IS CONVENIENT AND HAS ROOM FOR LARGE INSTRUMENTS |
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Term
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Definition
| SMALLER TELESCOPES CAN USE OTHER FOCAL ARRANGMENTS. THE ____THAT ISAAC NEWTON USED IN HIS FIRST REFLECTING TELESCOPE IS AWKWARD FOR LARGE TELESCOPES |
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Term
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Definition
| MANY SMALL TELESCOPES SUCH AS THIS ONE HAS A THIN CORRECTING PLACE IMPROVING THE IMAGE BUT IS TOO SLIGHTLY CURVED TO INTRODUCED SERIUOS CHROMATIC ABERRATION |
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