Does each planet have a law of gravitation?
The law of gravitation is not a question of any planet or star. It is a universal law. It is equally and strictly true of every particle of matter everywhere, and applies strictly between that particle...
View ArticleHas the Earth ever been weighed?
Yes, by several scientists. Its weight was first found by experiment in 1797-98 by an Englishman Henry Cavendish (picture, right), who estimated that our globe weighs about five and a half times as...
View ArticleHow much is the Earth flattened at the Poles?
The diameter of the Earth at the equator is 12,750 kilometres, and the distance between the poles is 12,712 kilometres. So the flattening is very small indeed. The Earth is commonly compared to an...
View ArticleWhy is the Moon sometimes visible during the day?
The Moon, as we all know, does not shine by its own light. when we see the Moon, it is only because we are seeing the reflection of sunlight reflected off its surface. We can see the Moon in the...
View ArticleIs there more moonlight in winter than summer?
In a nutshell, the answer is yes. But the reason is not just that winter nights are longer. The simple explanation is that the full or nearly full, Moon is obviously in the opposite part of the sky...
View ArticleWhich was the most damaging earthquake in recent history?
It was a July 28, 1976 earthquake that rocked the Chinese city of Tangshan at four o’clock in the morning. In less than a minute, 89% of the homes and 78% of the industrial buildings were destroyed....
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