d라이브러리
"NOT"(으)로 총 257건 검색되었습니다.- 대규모 탐색 작업과학동아 1991년 11호
- reach us and ours are not powerful enough to reach them.Second, they existIt is pleasant to know that we are possibly not living at the edge of destruction; that there are living beings ...
- 여성 천문학자들과학동아 1991년 11호
- comparison with the total distance.She studied the Cepheid variables in the Clouds. These are stars that pulsate. She noted in 1904 that the longer the period of light variation, the greater th ...
- 천랑성의 색깔과학동아 1991년 10호
- is considerbly larger and brighter than our sun and it can't support life, either. For one thing, it sould not remain on the "main sequence"(the majority of stars fall into the "main sequence" ...
- 식어가는 온천과학동아 1991년 10호
- the system can maintain its heat output without cooling off too fast or leaking excessively.Geothermal energy arises not from mere hot rock, but from magma-molten rock that lies 5 to 7 kilomete ...
- 화산과학동아 1991년 09호
- the stratospheric dust cut off a good deal of the sunshine and produced unusually cold temperatures. This was most noted in New England where there was snow every month of 1816, including July ...
- 더 밝은 물체과학동아 1991년 09호
- 몇주전 나는 지금까지 알려진 가장 밝은 물체를 이 지면을 통해 소개한 바 있다. 그런데 그 기록은 벌써 깨지고 말았다. 영국과 미국 천문학자들로 구성된 연구팀 ... or not, as the case might be. If the galaxies had formed quickly then here we are; if they had forme ...
- 우리의 조상인 실러캔스과학동아 1991년 08호
- change and did not develop. It is 400 million years old and has scarcely changed in all that time. What a pity it cannot withstand surface conditions. We could study it so much better if ...
- 토성의 테가 사라지고 있다과학동아 1991년 08호
- 토론토시에 있는 캐나다 이론천체물리연구소의 루크 돈스씨는 토성주위의 테를 세밀히 관찰하여 왔는데 올해 초 발표된 그의 연구결과는 놀랄만한 것이다.토성을 ... will disappear from our vision, Yet, even so, a sadness sweeps over us when we think that something so marvelou ...
- 가장 깊은 호수과학동아 1991년 07호
- are over 1,200 different species that live at different levels in the water and, of these, some three-fourths are not found anywhere else.The largest of the Lake Baikal fish are sturgeons, some ...
- 찾기 힘든 쿼크를 찾아서과학동아 1991년 07호
- and some may occasionally fall to Earth. Recently, physicists in Japan report they have detected a glob but that has not been confirmed.Once a glob hits Earth's atmosphere, it may break up into ...
