TAILIEUCHUNG - The Sky at Night Phần 10

Sự quan tâm gây ra căng thẳng đã được thay thế bằng một đốm trắng nhỏ. Sự quan tâm gây ra ở khắp mọi nơi, và kính viễn vọng trên toàn thế giới được đong đưa trở lại mặt trăng. Đã có được bất kỳ thay đổi thực sự? | 39 Onward to the Moon 155 the area and found that Linne no longer existed as a crater but had been replaced by a small white spot. This caused intense interest had been replaced by a small white spot. This caused interest everywhere and telescopes all over the world were swung back to the Moon. Had there been any real change The answer surely must be no. The appearance of Linne does change strikingly according to the angle of solar illumination. I have made many observations myself and I have found that there are occasions when Linne does look like a crater while at other times it is no more than a white spot. The final clue came much later when spacecraft had been sent passed the Moon and sent back very detailed images. Linne is in fact a small perfectly normal crater surrounded by a white nimbus. This means that Beer and Madler were wrong but this is quite understandable because as noted they used a small telescope. Any major surface changes on the Moon date back at least 2 000 million years and the main features were formed long before that. There was an argument about the origin of the craters. Were they volcanic or were they produced by meteorites hitting the Moon - a cosmic bombardment The argument began in the eighteenth century and was only finally settled in recent years. I admit that I was on the wrong side. I was convinced that the craters were of volcanic origin but it is now quite definite that they are impact structures. Photography began to play a major role in lunar work during the latter part of the nineteenth century. Then after the 1890s photographic lunar atlases were produced and we began to realise that we had a really good working knowledge of the whole of that part of the Moon which we can see from Earth. The Moon rotates in the same time that it takes to complete one orbit of the Earth. There is no mystery about this. Tidal forces over the ages have been the cause. However it means that part of the Moon is always turned away from us and .

• Tiếng Anh phổ thông
• Tài liệu nước ngoài
• Tài liệu ngoại ngữ
• Kiến thức ngoại ngữ
• Tài liệu tiếng Anh
• Architecture Knowledge