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It was not by chance that I chose moonless nights for our walks," said Father. "But tonight we need the Moon and not the stars. " "You can fly to the Moon on a rocket," said Alex. "People have already been on the Moon," Sveta added. " asked Father. 82 ’'Ηλιος Ρ. The Moorwis the nearest heavenly body to the Earth and the Earth's satellite. The average distance from the Earth to the Moon is about 384,000 kilometres "The stars are further," said Sveta quite certainly. "Yes, the stars," said Alex.
It is from the rays that we learn which stars are hotter. " Alex asked in wonder. "It takes very long," said Father. "It takes a ray more than eight years to get here from Sirius, for instance. You were not even born when the ray which arrived here today set out from Sirius. " asked Sveta. " 75 ’'Ηλιος Ρ. A small radiotelescope against the sky: the picture was photographed by a fixed camera The children listened with bated breath! " Father asked the children. "I think the stars are big," answered Sveta.
Alex was surprised. "Yes the Earth, you can watch the Earth from the Moon as we are now watching the Moon from the Earth," said Father. One evening the children, together with Father, were looking at a book with many photographs of the Earth taken from outer space. Some of the pictures showed the whole Earth, others only 87 The Earth Is Our Spacecraft ’'Ηλιος Ρ. part of it. Their Father explained that the Earth had been photographed from the Moon, from artificial earth satellites and from spacecraft.