THE SOLAR SYSTEM

The Solar System The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system. We often call it a solar family, with the sun as its Head.

SUN The sun is in the centre of the solar system. It is huge and made up of extremely hot gases. It provides the pulling force that binds the solar system. The sun is the ultimate source of heat and light for the solar system.

MERCURY Mercury is nearest to the sun. It takes only about 88 days to complete one round along its orbit.

VENUS Venus is considered as ‘Earth’s-twin’ because its size and shape are very much similar to that of the earth.

EARTH The earth is the third nearest planet to the sun. In size, it is the fifth largest planet. It is slightly flattened at the poles. From the outer space, the earth appears blue because its two-thirds surface is covered by water. It is, therefore, called a blue planet.

MARS Mars is the fourth planet from the Sun in the Solar System. Named after the Roman god of war, Mars, it is often described as the "Red Planet"

JUPITER Jupiter is the fifth planet from the Sun and the largest planet within the Solar System. It is a gas giant with mass one-thousandth that of the Sun.

URANUS Uranus is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System.

NEPTUNE Neptune is the eighth and farthest planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third largest by mass.

SATURN Saturn is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Named after the Roman god Saturn, is the god of agriculture.

Multiple Choice Questions Tick the correct answer. Q1 The planet known as the “Earth’s Twin” is (i) Jupiter (ii) Saturn (iii) Venus Q2 Which is the third nearest planet to the sun ? (i) Venus (ii) Earth (iii) Mercury Q3 All the planets move around the sun in a (i) Circular path (ii) Rectangular path (iii) Elongated path Q4 Asteroids are found between the orbits of (i) Saturn and Jupiter (ii) Mars and Jupiter (iii) The Earth and Mars

Answers Ans1 The planet known as the “Earth’s Twin” is (iii) Venus Ans2 Which is the third nearest planet to the sun ? (ii) Earth Ans3 All the planets move around the sun in a (iii) Elongated path Ans4 Asteroids are found between the orbits of (ii) Mars and Jupiter

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