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Chapter 8 – Man in Outer Space

Gravitation and Weightlessness

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Air forms a gaseous blanket over the earth. It is called the atmosphere. The atmosphere is responsible for the weather on earth, and it is an important part of man’s environment. The atmosphere extends to about 900 kilometres from the earth. It is dense, close to the earth’s surface but thins out further away from the earth. Beyond the atmosphere is the outer space. It is vast and without limit and the earth is extremely small in the immensity of the outer space.

Gravitation and Weightlessness

Gravity or gravitation is a natural phenomenon (universal effect) by which all things with mass or energy—including planets, stars, galaxies, and even light—are attracted to one another.

Gravitation is a type of force that …

Basic Science JS 1
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