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- 과학평론과학동아 1991년 12호
- duckbill is really nothing like a duck's. The nostrils are located differently and it is a rubbery structure rather than a horny one like the duck's.The water in which the duckbill lives is inv ...
- 시라노 드 베르주락과학동아 1991년 12호
- (This is a vision of the airplane, but what Cyrano needed was a propeller in place of legs and curved wings rather than straight ones.)None of these six methods will work, you see, because the ...
- 대규모 탐색 작업과학동아 1991년 11호
- to know that we are possibly not living at the edge of destruction; that there are living beings more advanced than we are and yet who have avoided destroying themselves.There you are, then. We ...
- 여성 천문학자들과학동아 1991년 11호
- the "Henry Draper Catalogue," which eventually come to contain the spectral classification of 225,300 stars brighter than the ninth or 10th magnitude.In 1925, she became the first person ever t ...
- 식어가는 온천과학동아 1991년 10호
- that a simple drill hole into a geopressured zone would unleash a gusher of geothermal heat plus a quantity of methane, or natural gas.The years of research has reduced optimism in this respect ...
- 천랑성의 색깔과학동아 1991년 10호
- the "main sequence" category on a diagram that measures stars' absolute magnitude and surface temperature) for more than a billion years or so as compared with the sun's 10 billion.(C) 1991, Lo ...
- 더 밝은 물체과학동아 1991년 09호
- in trying to decide just how galaxies form. Some believe they form in "free fall" and come into existence in less than a billion years.Others believe that galaxies form over a longer time, seve ...
- 화산과학동아 1991년 09호
- the "Ring of Fire" - the circle of volcanic activity around the Pacific from Japan to Latin America. (A little more than a century ago, Darwin's second son suggested this Ring of Fire marked th ...
- 우리의 조상인 실러캔스과학동아 1991년 08호
- biologists believe that lungfish are the ancestors of the tetrapods, and that the presence of lungs is more important than the presence of coelacanth fins or of amino-acid chains. The chances a ...
- 토성의 테가 사라지고 있다과학동아 1991년 08호
- than 0.7 grams per cubic centimeter. This is considerably less than the density of the other satellites and is less than the density of pure ice.Apparently, these satellites are m ...
