By P Klushantsev
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Extra resources for All about the telescope
It stops giving is short. In the day-time the Sun no longer us light when we come to the word "even- shines on us from above like in summer, ing". but from the ~ide. Its rays become-wan Now look how short the night is. and it slides obliquely acrosS the. Earth, What a long time in summer we spend warming it weakly. under the Sun's rays and what a short It becomes cold and winter arrives. time we spend in the shade. If we lived somewhere nearer the EquaIt's because the day is so long that the tor, for example, in India, we would night is short' and because the Sun shines never feel cold or put on a coat.
There was not enough water for the whole planet. From afar these cultivated regions, threaded onto the pipeline like beads on a string, look like mysterious dark stripes. How beautiful all this seems to the imagination! Martian cities! Martian palaces! Martian gardens in bloom! But as we approach Mars, the images we have conjured shatter one after the other. Almost all the light places on the planet turned out to be barren plains, as we supposed. True, here and there are pitted round depressions, similar to Moon craters.
So, the air would really create a prob on small planets. Small planets are strong enough to keep the air and gradually disperses. On Mars there is much less air than the Earth. It is quite thin there. There is almost no air on Mercury, on the Moon, as you know, there is air at all. It all dispersed a very long t ago. Air is not the only problem on sm planets: water's a problem, too. You water evaporates, especially when i warmed by the Sun: Water beco steam, mist and clouds. Mist and clo are already part of the air.