By P Klushantsev

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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. If it is attrac weakly, it disperses in space. For this reason there is almost no w on the small planets.. There's a drop of water on Mars it has all evaporated on the Mo There's not a drop of water on the Mo Even if you take a pail of water to Moon and pour it onto· the rocks, puddle ofwater will evaporate very quic Can You Land on Mercury?

More, the Earth is always tilted to the But now let's see Why it is that the Sun same side. This explains everything. does not cross the sky in winter· and in In our drawing the Earth's axis' is' SlImmer in the. same way. After all, the tilted to the right. The Earth flies round Earth always revolves in the same way. the Sun with its upper half,' the Northern This is caused by the Earth's ,axis Hemisphere, sometimes tilted towards which is, in fact, tilted. Th~t explains the Sun and sometimes away from it.

When you cross the sea on a large liner ry sky seems to be turning very slowly. you do not notice it turning. Look at a bright star. Now it is here and Of course, if the shore is in sight, you an hour later it will have moved nocan see when it turns by the land. But ticeably, but tomorrow at the same time what if you can't see the shore? What it will again be in its former position. This happens because the Earth is in if the ship is sailing in the open sea? Then you can only tell by the Sun that constant slow motion.

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All about the telescope by P Klushantsev

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