d라이브러리
"NOT"(으)로 총 234건 검색되었습니다.
- 나무 달력과학동아 l198801
- course, long-lived trees are rare, but even short-lived trees can be useful if, for some reason, their dead wood did not rot too quickly. Oaks, for instance, live only a few centuries, but some ...
- 시베리아에서 있은 폭발과학동아 l198801
- rich in iridium. That would account for the combination of the presence of iridium and the absence of a crater. Not everyone is going to accept that, though. The event remains a puzzle. Two poi ...
- 우리의 옛 선조들과학동아 l198712
- bones embedded in rock, then you determine the age of the rock, you will also have determined the age of the bones. Not all rocks have enough uranium in them to make a determination, but they a ...
- 책의 혁명과학동아 l198712
- screen's glow can be adjusted and softened. The electronic book won't bear much resemblance to a scroll. You may not be able to unroll in - or leaf through it - but it will never get dog-eared, ...
- 1백억 광년 떨어진 곳에과학동아 l198711
- two galaxies do not exist all by themselves, There may be other galaxies in the vicinity that are not quasars, that do not have super-active centers, and that are therefore invisi ...
- 가장 중요한 화석과학동아 l198711
- museum will not allow it and insists that Hoyle's intended tests would prove nothing one way or the other.I myself am not impressed by Hoyle's claims. For one thing, I doubt that ...
- 가장 오래된 것과학동아 l198710
- 2 billion years old.However, 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 ...
- 연료만들기과학동아 l198710
- then, catalysts or not, there will be no way of obtaining hydrogen.Is there anything that contains hydrogen that is not a fuel? Yes ― there is water, the weight of which is one-eighth h ...
- 에너지가 있는 곳으로과학동아 l198709
- for anything less than a global effort.Besides, the peaceful uses of such solar energy power stations in space should not be confined to a single nation. It makes sense to suppose that sunlight ...
- 가장 큰 날짐승과학동아 l198709
- that the pterosaurs waddled on the ground and were clumsy walkers. We might, therefore, further deduce that, when not flying, they hung from trees or cliffs.They were, in other words, like giga ...
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