Uranus was a planet which was larger than all the inner planets and could not be neglected. 1 Moreover, the discovery of Ceres in 1801 (i.e. only twenty years later) and further asteroids in the following years began a new era in the investigation of the solar system. Two important ...
Analysis: US scientists discover a new planet in solar systemSCOTT SIMON
句中有明确的时间状语last year(去年),表示过去某个特定时间发生的动作,所以要用一般过去时,discover的过去式是discovered。A选项是原形,用于一般现在时;C选项是现在完成时,表示过去发生的动作对现在造成的影响或结果,这里没有这种语境;D选项是一般将来时,表示将来的动作,均不符合题意。
32.C 细节理解题.根据句子Astronomers now believe there may be thousands of previously unknown objects orbiting the Sun at this distance,这里天文学家相信是有可能而不是一定,所以A选项不正确;根据句子Astronomers have discovered a new PINK planet on the edge of our solar system一个新的发现但是不是第...
2. Which of the following might be the focus in the debate over the definition of a planet? E. Its size and orbiting. F. Its size and structure. G. Its distance from the sun. . Its position in the solar system. 3. Which of the following tells the correct order of discovery in ...
Ninth planet of the solar system opened. New gas giant. Elements of this image furnished by NASA,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥
"They let us piece together the history of our Solar System. But almost all of these icy worlds are painfully small and faint: it's really exciting to find one that's large and bright enough that we can study it in detail." The new dwarf planet is estimated at roughly 700 kilometers...
根据最后一段中的“The International Astronomical Union re-garded Pluto as ‘a dwarf planet’ in 2006 ina decision that remains controversial(有争2.选D 推理判断题。根据第三段中的“It isthe first completion of the observations ofour solar system. It's giving us a new ideaabout how we human...
This gravitational shepherding could explain why the most-distant objects in our Solar System have similar orbits and these orbits keep them from ever approaching the proposed planet too closely, which is similar to how Pluto never gets too close to Neptune even though their orbits cross, according...
Most planets outside our solar system have been found using the radial velocity method, which measures the gravitational wobble in the star induced by the orbiting planet. The transit method would seem at first to be impractical because it requires a lucky break: The orbital plane of the planet...