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# What is the mass of the Earth?

What is the mass of the Earth, the scientists calculated more or less accurately: 6000x1018 tons. This is eighty-one and eight-tenths of the mass of the moon, three hundred and eighteen times less than the mass of Jupiter and about three hundred and thirty-three thousand times less than the mass of the sun.

If the size of the Earth was calculated even in ancient Greece (of course, with some inaccuracies, given the imperfection of the instruments of that time)

then the situation with the mass was much more complicated. Even the great Newton, who advanced further than other scientists of his time in the study of terrestrial gravity, failed to determine what the mass of the Earth is. It's seventy-one years after the death of the brilliant physicist and mathematician made his compatriot Henry Cavendish.

He, like most scientists of that era(the eighteenth century), was a "generalist". Among his research not only work in physics, but also in pneumatic chemistry, as well as in electricity.

Some experts in the field of the history of scienceindicate that it would be not entirely true to attribute the definition of the mass of the Earth to Cavendish. Allegedly he just identified the average density of our planet. But knowing the density and shape of the body, to determine its mass is a task for the pupil of the fifth grade of the general education school. Apparently, the mass of the Earth in numerical terms

Cavendish was simply not interested. He set a task for himself, and he achieved it, and everything else for him did not exist. This great scientist and a great eccentric became famous for his "quirks" during his lifetime. The last quirk was the order to bury him in the crypt, which was prescribed immediately tightly immured, leaving no inscription on it indicating who was buried here. Which was exactly fulfilled. There was not even a single portrait of this unique man made from nature.

Of course, after the death of Cavendish several times, as the instruments were improved, it was clarified what the mass of the Earth was. But the pioneer was still this rich Anglo-Norman nobleman.

What is interesting and important for us the mass of the Earth? It is interconnected with a number of physical constants. It is taken into account in ballistics, when space vehicles and satellites are launched, the first and second cosmic velocities, gravitational force, acceleration of gravity (G) directly depend on it. Do not list all! Naturally, there is no limit to the accuracy of calculating what the mass of the Earth is. As

creating more and more sophisticated instrumentswill be refined. But while in this specification there is no need: for the current level of development of science, the tolerances currently available are quite satisfactory.

The average density of a body defined by CavendishOur planet is just over five and a half grams per cubic centimeter. In this case, the density of granite, practically the most common mineral, is only two and seven tenths of a gram per cubic centimeter. According to geologists, the core of the Earth, compressed by incredible pressure, has a density of seventeen grams per cubic centimeter!

The motion of the Earth around its axis, coupled with the uneven distribution of substances of different density that make up our planet, is one of the factors that cause earthquakes.

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