d라이브러리
"today"(으)로 총 48건 검색되었습니다.
- Frog-And More In Space 우주공간에서의 개구리과학동아 l1992년 11호
- Only 4,000 species of vertebrates, out of a total of 40,000, are amphibians, and all of them are small. On Earth today, amphibians are declining in numbers and some species are near extinction ...
- 우주수프과학동아 l1992년 01호
- could then be viewed as a "soup" of such molecules, an "ocean soup", if you will. The ocean is still a kind of soup today, but living organisms are present. In the original ocean soup, there we ...
- 토성의 테가 사라지고 있다과학동아 l1991년 08호
- is absolutely black, so that if even a little of it is added to the ring material, the rings of saturn will grow dim. Today parts of the rings are bright and are clearly made up of ice, and thi ...
- 외계에서 날아온 반중력 우주선?과학동아 l1991년 04호
- 테두리 안에서 설명하려는 시도로서 잭 엡스타인은 1976년 3월호 '피직스 투데이'(Physics Today)지에 기고한 '반물질 (Antimatter)UFO'라는 제목의 글에서 UFO는 반물질이 대기중에서 수분동안 초고속으로 진행하며 계속적으로 물질과 반응해 붕괴 소멸작용을 일으켜서 소용돌이 운동을 하며 다량의 빛을 내는 ... ...
- 줄어드는 삼각주과학동아 l1991년 02호
- granary of the Roman Empire.Egypt continued to be prominent in medieval times as part of the Moslem world. Even today it supports a population of 50 million people, strung all along the course ...
- 블랙홀이 지구에도 있는가?과학동아 l1991년 01호
- ferociously it must be squeezed together to form a black hole.Scientists don't know of any process in the universe today that would form a "miniblack hole," one less massive than the sun, but b ...
- 슈퍼 다이아몬드과학동아 l1990년 10호
- heat very easily. This means that the use of bits of diamond in microchips or in other miniaturized components of today's devices will keep them from overheating. In addition, of all transparen ...
- 타조알과 인류의 나이과학동아 l1990년 07호
- now be able to come to some better conclusion as to how old "modern man"(a term describing all people living on Earth today) might be.The general feeling is that modern man, Homo sapiens, first ...
- 우주적 위험과학동아 l1990년 05호
- of such rare, useful mutations.Without cosmic rays, some think, evolution would be slowed to such an extent that even today there might be no life on Earth more advanced than bacteria.All this, ...
- 잘못된 경종과학동아 l1990년 05호
- that millions of years ago, the Earth's atmosphere contained 30 percent oxygen, rather than 20 percent as it does today. This seems unlikely on its face. With 30 percent oxygen, any forest fire ...
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