For one thing, the earth is just the right temperature.As the_third_planet from the sun,the earth seems to be just the right distance away.The planets which are closer to the sun are so hot that their surfaces bake(烘烤)in the sun.The farthest planets are cold balls. When the earth ...
Why does the earth have life while theother planets(行星) don't? For one thing, the earth just has the right temperature. As the third planetfrom the sun, the earth seems to be just the right distance away. The planets which are closer to thesun are so hot that their surfaces bake(...
D. When planetesimals accumulate to form planets, they inevitably contain gaseous as well as heavy elements. 正确答案:B 显示答案 进入答题 问题反馈收藏题目 译文 Elements of Life [#paragraph1][#insert1]The creation of life requires a set of chemical elements for making the [#highlight1]compone...
Venus and Earth are commonly regarded as twin planets but not identical twins. They are about the same size, are composed of roughly the same mix of materials, and may have been comparably endowed at their beginning with carbon dioxide and water. However, the twins evolved differently, largely...
aPtolemy’s Almagest introduces epicycles to describe the detailed motion of planets. Ptolemy的Almagest介绍周转圆描述行星的详细的行动。 [translate] anot all clean surfaces simply present the bulk termination at the surface not all clean surfaces simply present the bulk termination at the surface [...
Regularities among the planets have led astronomers to hypothesize that the Sun and the planets formed together in a giant, spinning cloud of gas and dust called the solar nebula. Astronomical observations show tantalizingly similar circumstellar disks around other stars. Within the solar nebula, mate...
Arrow keys control the view-point of planets and technology tree Page-up and page-down functions as zoom keys when viewing the solar system, a moon or planet, or the technology tree. If a base is selected the final zoom-in step will change to viewing that base specifically. Bases and pl...
Venus and Earth are similar in size and mass, so Venusian volcanoes may well have outgassed as much water vapor as on Earth, and both planets would have had about the same number of comets strike their surfaces. Studies of how stars evolve suggest that the early Sun was only about 70 ...
Select the correct answer. Which of the following elements makes up the majority of Earth's atmosphere? a. Oxygen b. Hydrogen c. Argon d. Nitrogen Elements in the atmosphere Although the Earth's atmosphere contains a lot of nitroge...
ait takes a spaceship about eight months to reach mars from the earth when the tow planets are closest to each other.scientists are still searching for more information about mars. 当拖曳行星是最接近的.scientists仍然互相搜寻对于关于火星时的更多信息需要太空飞船大约八个月到达火星从地球。 [translate...