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- 윤초(閏秒)과학동아 l198806
- that the day has become a second longer. We can then define the second as a very tiny bit longer than it is now so as to keep the same number of seconds per day.But meanwhile, a l ...
- 우리는 지금 몇 살인가?과학동아 l198806
- in the bones. Perhaps, if the results hold up, anthropologists may decide tp con-sider Neanderthal man and modern man as different species again.Also, if Neanderthal man and modern man coexiste ...
- 성단(星団)이라는 측정자과학동아 l198805
- the distance. In a way, it might not seem this gives us anything new. A bright globular cluster is about as bright as the brightest supergiant single stars, and we use those super-bright ...
- 감마선의 시사과학동아 l198805
- about 300 miles across where must be gas at a temperature of serveral billion degrees. At such a temperatute this gas produces electron-positron pairs that annihilate each other and prod ...
- 알기 어려운 쿼크과학동아 l198804
- to force particularly massive atomic nuclei into collisions at enormous energies, if we built powerful enough atom-smashing machines. The shattering nuclei may then liberate, just briefl ...
- 우주의 비밀을 알려줄 폭발과학동아 l198804
- The time may come when bursts from supernovas will routinely be received and analyzed. (There may be 10 supernovas a year in our galaxy alone and equal numbers in other galaxies nearby. ...
- 가장 생명력이 강한 것과학동아 l198803
- belonging to a family of bees that still exists in tropical regions. Presumably, New Jersey, 80 million years ago, was considerably warmer than it is now.To have evolved to that advanced stage ...
- 태양계의 종말은?과학동아 l198803
- avoid other kinds of disaster. Surely, by then, humanity will have practical interstellar travel. We will find it easy to build huge cities in space that will carry us outward on long, l ...
- 옛 괴물들과학동아 l198802
- 지난 달, 태고의 새로운 괴물이 발견되었다고 발표되었다. 사우스 캐롤라이나주 찰스톤에 공항을 세우기 위해 땅을 파던중에 오늘날 펠 ... the only one to make fire, wield electricity and stand on the moon, is alive today. It is Home sapiens, and, as geo ...
- 가솔린 바다과학동아 l198802
- essential to maintain the settlements and that are relatively rare on most of the worlds we can approach. (The moon has none of these elements, for instance, so lunar colonists will depend on E ...
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