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- 나무 달력과학동아 l198801
- track the weather back 11,000 years. They can't go farther back than because before 11,000 years ago, northern Europe was covered by the glacier of the Ice Age. Nevertheless, they will have a c ...
- 시베리아에서 있은 폭발과학동아 l198801
- in vast numbers. Second, suppose such an event happened now in the Soviet Union or in the United States. Such a blast might be taken to be an enemy nuclear bomb, and a vengeful. The horr ...
- 우리의 옛 선조들과학동아 l198712
- 인류는 지구상에 새로 온 손님이다. 우리는 지구의 아주 오랜 수명과 비교해서 볼 때 이곳에 오래 동안 존재하지는 않았으나, 우리가 생각하는 것 ... as recently as two centuries ago. But (just to keep a sense of proportion) hominids have still existed ...
- 책의 혁명과학동아 l198712
- time. In addition, a huge small bookcase. The scanning device must be powered, but small nuclear batteries could last through years of frequent use. But will books on computer become a n ...
- 1백억 광년 떨어진 곳에과학동아 l198711
- the new discovery would show that such clusters may already have existed 10 billion years ago. If so, that would force astronomers to sharpen some of their views on how galaxies formed in the f ...
- 가장 중요한 화석과학동아 l198711
- Much more important, at least tow other fossils of archeopteryx have been found and they, too, have feathers arranged as in the first fossil.Three identical hoaxes? That's harder to bel ...
- 가장 오래된 것과학동아 l198710
- Butcher's measurements are extremely delicate and it may be that the stars he studied are not actually the oldest. Astronomers therefore reacted to the new estimate with caution. The ag ...
- 연료만들기과학동아 l198710
- 인간의 첫 번째 에너지원은 자신의 근육말고는 불이었다. 즉, 자신의 주변세계에서 쉽게 찾아볼 수 있는 연료를 태우는 일이었다. 우리는 다른 에너지원―태양에너지,핵융합, ... (puls sunlight) into hydrogen, burn the hydrogen and get water again. The fuel would never be used up ...
- 에너지가 있는 곳으로과학동아 l198709
- that the surest way of countering such a possibility is to internationalize such huge space projects that may, in any case, be too expensive for anything less than a global effort.Besides, the ...
- 가장 큰 날짐승과학동아 l198709
- 약 6천5백만년 전 지상의 날짐승 가운데 가장 큰 덩치를 가졌던 '프테로사우루스'가 갑자기 멸종해 버렸다. '프테로사우루스'의 사라짐은 우리에게 가장 까다로운 수수께끼의 하 ... but their bone structure was that of reptiles, and in all likelihood, they laid eggs rather ...
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