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Chapter 9 – The Earth in Space

The Solar System

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Planet Earth is one of the heavenly objects moving endlessly in space. The universe is the infinite space which contains the earth and other heavenly bodies. It is the totality of all the matter, energy and space in which the earth and other extra-terrestrial bodies can be found.

The Earth – our home planet is the third planet from the Sun, and the only place we know of so far that’s inhabited by living things. While Earth is the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.

The Solar System

The solar system consists of our star, the Sun, and everything (that revolves around it) bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids. Beyond our own solar system, it has been discovered that there are thousands of planetary systems orbiting other stars in the Milky Way.

The solar system is divided into inner and outer parts. The inner part contains the Sun, Mercury, Venus, Earth and Mars while the outer part contains Jupiter, Saturn, Uranus and Neptune. The two parts are demarcated by asteroid belt.

Note: The planets are the components of the solar system.

Important Facts About Our Solar System

The Solar System
The Solar System
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