astronomical observations show that the center of mass of th

英语翻译
RT,尤其是中间两句the value of 一直到 from the sun
In astronomical units—not perfect,but tantalizingly close.The value for Mars is off by… 6 or 7 percent or so.It’s within 10 percent of average distance to Mars from the Sun.But I kind of have to skip the one after mars for now.Then Jupiter’s right there at 5-point something,and then Saturn is about 10 astronomical units from the sun.

The Astronomical Association _________ meets once a week
which I am a member
in which I am a member
on which 1 am a member
on which I am a member of 选哪个

Actually we know of no type of astronomical body // in which the conditions can be favorable to life / except planets like our own revolving round a sun.
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19—ther are astronomical instruments and other equipments,time and human hall,science and tech hall,astronomy exchanging hall and meridian instrument room.4137
想问：
1—time and human hall：
2—astronomy exchanging hall：
3—meridian instrument room：

英语翻译
In contrast,our image of the astronomical universe,of even of earth’s geological history,can easily be subject to revolutionary changes as new data comes in and new theories are worked out.If we define the “security” our image of various parts of the total system as the probability of their suffering significant changes,then we would reverse the order of hardness and see the social sciences as the most secure,the physical sciences as the least secure,and again the biological sciences as somewhere in between.Our image of the astronomical universe is the least secure of all simply because we observe such a fantastically small sample of it and its record-keeping is trivial as compared with the rich records of the social systems,or even the limited records of biological systems.Records of the astronomical universe,despite the fact that we see distant things as they were long ago,are limited in the extreme