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"earth"(으)로 총 218건 검색되었습니다.
- 가장 약한 파(波)―중력파 The Weakest Wave과학동아 1989년 09호
- it would take the wave about one-twenty-third of a second, moving at the speed of light, to pass from one end of the Earth to the other. By working with such tiny time discrepancies, it might b ...
- 녹색 식물의 탄생 How Green Plants Began?과학동아 1989년 09호
- complicated type that make up plants and animals formed about 1.4 billion years ago. By that time, though, the planet Earth had already existed for 3.2 billion years, so there was a long period ...
- 소행성의 근접신호과학동아 1989년 08호
- be thousands that are a few dozen feet across. Obviously the chance that some one out of all these will finally strike Earth is far greater than the chance that some particular one, like the on ...
- 초기인류의 언어능력을 말해주는 뼈과학동아 1989년 08호
- 00 years ago, could speak. Their brains simply weren't large enough.That leaves Neanderthal man, who first appeared on Earth perhaps as much as 300,000 years ago, and didn't become extinct till ...
- 지하생활과학동아 1989년 07호
- 인구가 너무 밀집되어 땅값이 성층권으로 치솟고 있는 일본은 밑으로 즉 지하로 이동하려는 생각을 하고 있다. 이들은 지하 하수 시설, 지하 ... I happen to like enclosed spaces. Back in 1953, I wrote a novel titled "The Caves of Steel" in which I described an ...
- 마지막 남은 청정지역과학동아 1989년 06호
- addition, we have a responsibility to try to protect and preserve in as pristine a state as possible the few areas on Earth not yet spoiled by man.Opening up the continent for the pleasure of t ...
- 예수의 수의과학동아 1989년 05호
- and century to century as long as the cosmic ray bombardment is regular. Although the quantity of carbon 14 present on Earth is minuscule, it is easily detected, and its amount measured, becaus ...
- 지진 The Earth Trembles과학동아 1989년 04호
- analysis may tell us just when the strains will give at certain points and then we can build a real picture of future earthquake distribution in both time and space, and take the best action to ...
- 대기권 밖의 망원경과학동아 1989년 04호
- 발견해야만 할 것이다.As long ago as 1962 it was suggested that we put a large telescope into orbit about the Earth, and now, finally in 1989, it looks as though that will be done at last. A telescope wi ...
- 인류최초의 발견─불의 사용과학동아 1989년 03호
- This species became extinct not long after the time the fires in the cave were apparently being used, leaving the Earth to be dominated by Homo erectus and its descendants, Homo sapiens. There ...
