d라이브러리
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- 우주 오염과학동아 l198812
- must be made more massive and therfore more expensive to launch. And what about spacesuits and spaceships? They are not 100 percent safe either. It is possible that in 100 years, it simply woun ...
- 한쪽으로 늘어진 위성과학동아 l198811
- half the surface?A year from now, Voyager 2 will pass within 3 million miles of Nereid. This world may turn out to be another two-toned satellite and perhaps it will give us hints as to how it ...
- 행성군(群)과학동아 l198811
- 지금까지 거의 반세기 동안, 천문학자들은 행성들이 보편적이며, 대부분의 또는 모든 항성들에 수반된다고 믿어왔다. 이것은 특히 우리의 태양처럼 주위에 반 ... common, than, very occasionally, intelligent life-forms may develop and produce technolgical civilizations, so ...
- 동요하는 지구과학동아 l198810
- time to time. Usually, this is a result of a large earthquake, which shifts the balance of rocks inside the Earth- not much, but just enough to put a kink in Earth rotation that slowly shifts t ...
- 꿈이 현실로 되다과학동아 l198810
- of the benzene problem, which con sumed all his thoughts.He fell into a doze and even while sleeping, the problem did not leave him. He dreamed about chains of carbon atoms, twisting this way a ...
- 다이아몬드 개량과학동아 l198809
- arrangement of the carbon atoms that seems to make a film that is even harder than ordinary diamond. They are not sure what the distortion is or why it should make diamond even harder, but if t ...
- 번개와 생명과학동아 l198809
- Human-made acid rain contains sulfuric acid as well as nitric acid. Sulfuric acid is particularly harmful and is not a component of lightning acid rain.In addition, human-made acid rain is con ...
- 별을 본다는 것(점성술)과학동아 l198808
- and far-out nonsense. It is no use for scientists to explain there's nothing to such things, The superstitious know nothing about science and would, in any case, refuse to accept reason, ...
- 최고(最古)의 날짐승과학동아 l198808
- fossil was the size of a robin.(The smaller an organism, the easier it is for it is for it to fly.)The new fossil has not entirely divorced itself from its lizard forebears. Its hind limbs and ...
- 마지막 정리과학동아 l198807
- of cubes, of fourth powers and so on. He scribbled in the margin of the book that you could add squares to get another square, but there it stopped. No cubes or any higher powers could be adde ...
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