(彗星) or small planets ran into each other with Saturn’s moons. Earth has only one moon. But Saturn has at least 60 moons. And this left behind a large amount of ice and rock pieces. These pieces are different in size. Some are as small as a grain of sand. Others are as large...
根据第一段"The distances from the Sun to Mars is more than 141 million miles."从太阳到火星的距离超过1.41亿英里。可知,问题句子与文章不符。故填:F。(2)F.句子意思:火星是可以用望远镜从地球上看到的行星之一。根据第二段"and one of the planets that can be seen from the Earth ...
根据第二段"However,it was quite challenging to get a clear image of those objects using ground-based antennas.The reason is that low-energy radiation is absorbed and distorted by water vapor(水蒸气)in the Earth's atmosphere." 然而,使用地面天线获得这些物体的清晰图像是...
B. It does not take into account the amount of time needed for gas planets to form. C. It is more applicable to star formation than the core-accretion theory is. D. Solid particles are believed to own a small proportion of the outer accretion disk. 你的答案: 正确答案:D 题目解析: 登...
Intheearlieststagesofman'sdevelopmenthehadnomoreneedofmoneythananimalshave.Hewascontentwithverysimpleformsofshelter,madehisownroughtoolsandweaponsandcouldprovidefoodandclothingforhimselfandhisfamilyfromnaturalmaterialsaroundhim.Ashebecamemorecivilized,however,hebegantowantbettershelter,moreefficienttoolsandweapons,andmo...
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(1) We Know That the Earth is Billions of Years Old–click to visit (2) Some Things Cannot be Known–click to visit (3) Economic Externalities Are Spoilers of Free Markets–click to visit (4) The Speed of Light In Vacuum Is a Universal Constant–click to visit ...
B. It does not take into account the amount of time needed for gas planets to form. C. It is more applicable to star formation than the core-accretion theory is. D. Solid particles are believed to own a small proportion of the outer accretion disk. 你的答案: 正确答案:D 题目解析: 登...
根据第二段"However,it was quite challenging to get a clear image of those objects using ground-based antennas.The reason is that low-energy radiation is absorbed and distorted by water vapor(水蒸气)in the Earth's atmosphere." 然而,使用地面天线获得这些物体的清晰图像是...
MALE PROFESSOR: Last week we discussed the formation of Earth and the other rocky planets—the planets in the inner solar system. Uh, s-so, what about the gas giants? Jupiter, Saturn, Uranus, and Neptune.Well, there's two theories. But first, let's recap. We believe our solar system...